乘法交换律和结合律练习题
四年级乘法交换律和结合律强化训练题

小学四年级数学上册乘法交换律与结合律专项训练知识要点:123x 99 +123125 x 7+12579 x 99+79二、计算下列各题能简算要简算35x 10247x 10125x 4498x 37 87x 199 25x 19945x 201-45 38x 101-38 25x 199+2599x 201-99102x 83 125x 88乘法分配律 (a+b ) x c=a x c+b x c 乘法交换律 axb=b x a 一、计算下列各题 乘法结合律 (a >b) X c=a x (b >C) 加法结合律 (a+b)+c=a+(b+c)(25 x 125)x( 8X 4) (4+8)x 25 35x 37+65x 37135x 6+65x 6 43+25)x 40 8x( 125+7)18x 82+18x 47+18x 712 5x( 40- 4) 16x 256-16 x 56125x( 80+8)69x 45+31 x 45 38x 29+384X 24+26X 24 30X 2+25X 2 (30X 25)X 4033X 15X 2 25 X 7X 4X 325X 50X 8 25 X 125X 16125X 32X 25 4X (25 X 9)16X 25X 12538X 5X 45X (19 X 2) 4X 45X 2525X 23X 8 125 X 72(25 X 125) X 32(30X 25) X 40(15X 25) X 415X (25 X 4)(6 X 12) X 56X (12 X 5)(13X 5) X 205 X (13 X20)125X 4835X 2X 5(60X 25) X 4125X 5X 864X 125125X 3225X 35X 16 125X 24124 X 25-25 X 24 (80+8)X 25 35X 37+65X 37135X 6+65X 643+25)X 40 8X ( 125+7)18X 82+18X 47+18X 71三、直接写得数25 X4= 4 25X 5X2= 12 5= (15X25) X4 =6 X12 X5)=8 125= 20 X5= 50 4=(6 X12) X5=13 (5 X20)=四、用简便方法计算4 X8 X25X12535 X2 X5=35 X( 2 J)125 X5 X8= (__ X_) X5(8 刈25)125 X8 X8 42 XI25 X8 25 X6 X4 (25 X4) X6 8X(7X2 5)125 X32 64 M25 2 5 XI(60X25)i X4=60 X(_ X _) X (4X25)8 X4 X125 X25 125X8 X4125 X16 16 252 2 7X4 X5125X 16 16X 25 56 X12525 X12836 X2525 X 12 25 X 24 X 5 28 X 25299X 120+120 38 X25 X4 8 X17 XI2523 X 3= 70 X5=13X100= 25 X4=125 X8= 125 X8=4 ><50=15X( 25X4)=(13 X5) X20=2 X50=1、 ① (36+64 ) X13 与 ② 36 X13+64 X 132、 ① 135 X 15+65 X 15 与②(135+65 ) X 153、 ① 101 X45 与② 100 X45+1 X 454、 ① 125 X 842 与② 125 X800+125 X 40+125 X2 二、判断下面的 5 组等式,应用乘法分配律用对的打1、 (7+8+9) X 10=7X 10+8X 10+92、 12X 9+3X 9 = 12+3 X 93、 (25+50) X 200 = 25 X 200+504、 101 X 63=100 X 63+635、 98 X 15= 100 X 15 + 2 1X 5) ) () ()V ;应用错的打 () () () () )80+8 ) X 2532 (X 200+3 )38 39X +383528X + 7020X 17X 2X 5X 2X 21 10 X 2+90 X 2(110+90)X 2 12 X 105乘法分配律练习题 138X 62+38X 38 75X 14—70X 14101X 3812 X 98 55 X 99+55 55X 9912X 29+12 58X 199+58 42X 79+4252X 89 69X 101—69 55X 21—55125X ( 80+8) 125X ( 80X 8)125 X 32X 25乘法分配律练习题 2、选择。
乘法交换律和结合律练习题

乘法交换律和结合律练习题一、选择题1. 根据乘法交换律,下列等式正确的是:A. 3×4=4×3B. 2×5=5×2C. 6×7=7×6D. 所有选项2. 根据乘法结合律,下列等式正确的是:A. (2×3)×4=2×(3×4)B. (5×6)×7=5×(6×7)C. (8×9)×10=8×(9×10)D. 所有选项3. 下列哪个等式不能使用乘法结合律:A. (2×3)×4B. 2×(3×4)C. (2+3)×4D. 2×(3+4)二、填空题1. 请使用乘法交换律计算:______×12=12×______。
2. 请使用乘法结合律计算:(3×4)×5=______×______。
3. 计算下列表达式,并说明是否使用了乘法交换律或结合律:(a) (2×3)×4(b) 2×(3×4)(c) 6×(7+8)三、判断题1. 乘法结合律只适用于两个数的乘法。
(对/错)2. 乘法交换律可以改变乘法运算的顺序,但乘积不变。
(对/错)3. 乘法交换律和结合律可以同时使用。
(对/错)四、计算题1. 计算下列各题,并说明使用了哪种运算律:(a) 3×4×5(b) 8×(9×10)(c) 7×8×92. 如果不使用乘法交换律和结合律,计算下列表达式的结果:(a) 2×3×4(b) 5×6×7五、应用题1. 一个班级有12个小组,每个小组有8名学生。
计算这个班级总共有多少名学生,并说明你是如何计算的。
乘法交换律和结合律练习题

乘法交换律和结合律练习题一、用简便方法计算下面各题23×15×2125×7×250×56×475×9×2二、在□里填上适当的数35×8=35×45×12=45× 16×15=16× 18×25=18× 125×32=125×25×24=25×三、用简便方法计算:45×828×125×1125×3275×24四、判断18×12×5=18×,这应用了乘法结合律。
5×=×9,这是应用了乘法交换律。
五、应用乘法交换律和结合律,在□里填上适当的数。
125×7×8=×45×25×□=45×5×=×xa×b×c=a×5×16= 45×=×□六、用简便方法计算下面各题69×25×424×125×25×326×1569×10×125×87+184+461+43+39+157479+20279-×4125×72七、一筐橘子重47千克,每千克橘子能卖4元钱,5筐这样的橘子能卖多少钱?八、一盒铅笔25元,买了16盒,应付多少元?九、建筑队运沙,一辆车每次可运8吨,14辆车25次可以运沙多少吨?十、张师傅一天加工了135个零件,李师傅两天加工的零件是他的3倍还要多53个。
李师傅两天一共加工了多少个零件?乘法交换律与结合律练习题作者:孙道所一、仔细想,认真填1、两个数相加,交换加数的,和不变,这叫做。
乘法交换律和结合律练习题

______________________________________________________________________________________________________________乘法交换律和结合律练习题一、仔细想,认真填1、两个数相加,交换加数的,和不变,这叫做。
用字母表示为。
2、三个数相加,先把相加,再与相加;或者先把相加,再与相加,它们的和不变,这叫做。
用字母表示为。
3、两个数相乘,交换乘数的,积不变,这叫做。
用字母表示为。
4、三个数相乘,先把相乘,再与相乘;或者先把相乘,再与相乘,它们的积不变,这叫做。
用字母表示为。
5、73+99+27=99+(73+27) 是根据加法( )律和( )律;9×125×8 =9×(125×8),这里运用了乘法( )律;(25×37)×4=37×(25×4)。
这里运用了乘法( )律和( )律。
6、在○里填>、<或=符号。
125×24○125×8×3 27×4×25○27×(4×25) 67×8○68×77、在□内填上数,在○内填上运算符号,在横线上填上运用的运算定律。
29+37+171=37+(□○□)。
42×5×8=42×(□○□)。
47+□=28○□。
427+39+73=(427+□)○□。
35×21×2=21×(□○□)。
8、计算64×26后,可以交换两个乘数的位置进行验算,是运用了()律。
9、25×(20×39)=(25×20)×39 这是运用了()律。
10、用简便方法计算76+98+24,要先算(),这是根据()律。
二、对号入座:(把正确的答案的序号填在括号里)1、下面一个零也不读的数是( )。
乘法交换律结合律分配律练习题

乘法交换律结合律分配律练习题135×6+65×6×40×18×82+18×47+18×71× 16×256-16×56125× 9×45+31×4538×29+38123×9+1212×7+12×99+7935×1027×101 5×4445×201-4598×3738×101-37×19925×199+2525×1999×201-9 102×125×88124×25-25×24×25×37+65×37135×6+65×6125×3125×8××6×40 ×18×82+18×47+18×714×24+26×20×2+25×2×40× 15××××20 13×9×120+12038×25×48×17×125××4×125×2564×125125×1616×2527×4×58×195×25×42×125×8×520×17×2×5×2×110×2+90××8×25×12525×6×4125×8×2×125×25×12 125×489×12×105 乘法分配律练习题338×62+38×385×14—70×1101×3812×985×99+555×9912×29+1258×199+582×79+4269×101—695×21—5125×125× 9×99+998×7+31×1479×25+22×25—225×46+50×27乘法分配律练习题2一、选择。
(完整版)乘法交换律与结合律及简便算法练习题

乘法交换律与结合律及简便运算练习题一.填空:1.15×16=16×□乘法-------------侓2.25×7×4=□×□×7 乘法------侓3.(60×25)×□=60×(□×8)乘法---侓4.125×(8×□)=(125×□)×14 乘法—侓5.3×4×8×5=(3×4)×(□×□)乘法—侓二.填合适的数:1.36×15=15×()2.25×17×4=(□×□)×173.(11×25)×□=11×(□×4)4.30×6×7=30×(□×□)三.简便计算:1.25×36×42.17×125×83.25×5×4×64.4×49×255.15×226.50×(326×20)7.125×17×16四.应用题:1.学校有一幢5层教学楼,每层有12间教室,每间教室有6个窗户。
整幢楼共有窗户多少个?2.一个游泳池长50米,小明每次游6个来回。
他每次游多少米?3.实验小学新盖一幢4层教学楼,每层有5间教室,每间教室要配25套双人座椅,实验小学一共需要购进多少套课座椅?(你能用两种方法解决吗?)4.同学们乘车去参观学习。
每辆车坐50人,用7辆车送两次才把所有的同学送走,去参观学习的同学有多少人?5.用拖拉机运化肥,每辆一次运14袋,每袋重75千克,8辆拖拉机一次可以运化肥多少千克?6.同学们体操表演,一共有8个方阵,每个方阵有9行,每行有25人,一共有多少人?7.学校组织同学们去旅游,租了2辆汽车,每辆坐24名学生,租车费一共是960元,进山时,每人买门票15元,坐索道上山,每人交费25元。
人教版四年级 乘法交换律和结合律练习题
乘法交换律和结合律练习题一、仔细想,认真填1、两个数相加,交换加数的,和不变,这叫做。
用字母表示为。
2、三个数相加,先把相加,再与相加;或者先把相加,再与相加,它们的和不变,这叫做。
用字母表示为。
3、两个数相乘,交换乘数的,积不变,这叫做。
用字母表示为。
4、三个数相乘,先把相乘,再与相乘;或者先把相乘,再与相乘,它们的积不变,这叫做。
用字母表示为。
5、73+99+27=99+(73+27) 是根据加法( )律和( )律;9×125×8 =9×(125×8),这里运用了乘法( )律;(25×37)×4=37×(25×4)。
这里运用了乘法( )律和( )律。
6、在○里填>、<或=符号。
125×24○125×8×327×4×25○27×(4×25)67×8○68×77、在□内填上数,在○内填上运算符号,在横线上填上运用的运算定律。
29+37+171=37+(□○□)。
42×5×8=42×(□○□)。
47+□=28○□。
427+39+73=(427+□)○□。
35×21×2=21×(□○□) 。
8、计算64×26后,可以交换两个乘数的位置进行验算,是运用了()律。
9、25×(20×39)=(25×20)×39 这是运用了()律。
10、用简便方法计算76+98+24,要先算(),这是根据()律。
二、对号入座:(把正确的答案的序号填在括号里)1、下面一个零也不读的数是( )。
A.600030B.603000C.6003002、与480×40的积一样的算式是( )。
A.48×40B.480×400C.48×4003、用两个4和三个0可以组成( )个不同的五位数。
小学四年级数学下册:《乘法交换律、结合律》练习题
一、填空。
1、两个数相乘,交换两个(因数)的位置,(积)不变,这叫做(乘法交换律)。
用字母表示为(a×b=b×a )。
2、三个数相乘,先把(前两个数)相乘,或者先把(后两个数)相乘,(积)不变,这叫做(乘法交换律)。
用字母表示为((a×b)×c=a×(b×c))。
3、在连乘算式中,如果某两个因数的积正好是整十、(整百)、(整千)……数,运用(乘法交换律)或(乘法结合律)先把这两个数相乘,再与其他数相乘,这样能使计算简便。
二、根据乘法运算定律,填上适当的数。
1、27 ×a= a ×272、25×9×2= 25 × 2 ×93、b×(15×27 )=(b×15 )×274、125×5×8×2=(125 ×8 )×( 5 × 2 )三、计算下面各题,怎样简便就怎样算。
25×43×8 125×6×7×8=25×8×43 =125×8×(6×7)=200×43 =1000×42=8600 =42000四、小明每天从家去学校往返2次,他家到学校的距离是750m,他一个星期(按5天计算)一共要走多少米?750×4×5=15000(米)答:他一个星期一共要走15000米。
五、陈老师正在给一部书稿排版。
每行排20个字,每页可以排27行,正好排了50页。
这部书稿一共有多少个字?20×27×50=27×(20×50)=27000(个)答:这部书稿一共有27000个字。
六、简算。
6161×39-3939×61=61×101×39 -39×101×61=0。
口算题 (乘法交换律和结合律) 1000题
8 × 125 × 8 = 25 × 73 × 4 = 25 × 84 × 4 = 86 × 25 × 4 = 88 × 25 × 4 = 17 × 25 × 4 = 25 × 47 × 4 = 38 × 25 × 4 = 25 × 25 × 4 = 125 × 5 × 8 = 42 × 25 × 4 = 8000 ÷ 8 ÷ 125 = 3000 ÷ 25 ÷ 4 = 14 × 25 × 4 = 25 × 91 × 4 = 6700 ÷ 25 ÷ 4 = 96 × 25 × 4 = 25 × 87 × 4 = 125 × 2 × 8 = 125 × 15 × 8 = 16000 ÷ 8 ÷ 125 = 13000 ÷ 25 ÷ 4 = 25 × 6 × 4 = 13000 ÷ 8 ÷ 125 = 5 × 125 × 8 = 25 × 66 × 4 = 2000 ÷ 25 ÷ 4 = 12000 ÷ 125 ÷ 8 = 800 ÷ 25 ÷ 4 = 14 × 125 × 8 = 7 × 125 × 8 = 25 × 26 × 4 = 62 × 25 × 4 = 1000 ÷ 8 ÷ 125 = 125 × 8 × 8 = 30 × 25 × 4 = 25 × 22 × 4 = 125 × 18 × 8 = 10000 ÷ 8 ÷ 125 = 5600 ÷ 25 ÷ 4 = 52 × 25 × 4 = 76 × 25 × 4 = 10000 ÷ 4 ÷ 25 =18 × 25 × 4 =15000 ÷ 8 ÷ 125 =练习范围: 月 日 姓名: 乘法交换律和结合律题数: 100 分 秒 成绩:25 × 59 × 4 =7800 ÷ 25 ÷ 4 =6000 ÷ 125 ÷ 8 = 18 × 125 × 8 =15 × 125 × 8 =7000 ÷ 125 ÷ 8 = 125 × 16 × 8 =1000 ÷ 125 ÷ 8 =7000 ÷ 25 ÷ 4 = 20000 ÷ 4 ÷ 25 =19000 ÷ 8 ÷ 125 =25 × 40 × 4 =25 × 75 × 4 =13 × 125 × 8 =11000 ÷ 8 ÷ 125 = 34 × 25 × 4 =10000 ÷ 125 ÷ 8 =20000 ÷ 125 ÷ 8 = 17000 ÷ 125 ÷ 8 =19 × 125 × 8 =7000 ÷ 8 ÷ 125 = 25 × 12 × 4 =10 × 125 × 8 =12000 ÷ 4 ÷ 25 = 2000 ÷ 125 ÷ 8 =20000 ÷ 25 ÷ 4 = 3 × 125 × 8 =28 × 25 × 4 =10000 ÷ 25 ÷ 4 =3000 ÷ 125 ÷ 8 = 85 × 25 × 4 =25 × 60 × 4 =6600 ÷ 25 ÷ 4 = 24 × 25 × 4 =18000 ÷ 125 ÷ 8 =26 × 25 × 4 =20 × 125 × 8 = 6 × 125 × 8 =125 × 6 × 8 =74 × 25 × 4 =25 × 48 × 4 =20000 ÷ 8 ÷ 125 = 125 × 10 × 8 =19000 ÷ 125 ÷ 8 =25 × 98 × 4 = 125 × 17 × 8 =5900 ÷ 25 ÷ 4 =8000 ÷ 4 ÷ 25 = 125 × 13 × 8 = 4 × 125 × 8 =125 × 3 × 8 =12 × 25 × 4 =16 × 125 × 8 =3000 ÷ 4 ÷ 25 = 5500 ÷ 25 ÷ 4 =25 × 33 × 4 = 13000 ÷ 125 ÷ 8 = 25 × 79 × 4 = 18 × 25 × 4 = 20000 ÷ 125 ÷ 8 = 34 × 25 × 4 = 94 × 25 × 4 = 13 × 25 × 4 = 20 × 25 × 4 = 14 × 25 × 4 = 8000 ÷ 125 ÷ 8 = 125 × 6 × 8 = 16 × 125 × 8 = 25 × 58 × 4 = 12000 ÷ 4 ÷ 25 = 12 × 125 × 8 = 8000 ÷ 8 ÷ 125 = 125 × 16 × 8 = 11000 ÷ 8 ÷ 125 = 1000 ÷ 8 ÷ 125 = 8200 ÷ 25 ÷ 4 = 5 × 25 × 4 = 10000 ÷ 25 ÷ 4 = 18000 ÷ 125 ÷ 8 = 13 × 125 × 8 = 125 × 2 × 8 = 3 × 25 × 4 = 800 ÷ 25 ÷ 4 = 62 × 25 × 4 = 10000 ÷ 4 ÷ 25 = 5000 ÷ 4 ÷ 25 = 67 × 25 × 4 = 20 × 125 × 8 = 7000 ÷ 25 ÷ 4 = 2900 ÷ 25 ÷ 4 = 6000 ÷ 125 ÷ 8 = 4000 ÷ 125 ÷ 8 = 25 × 49 × 4 = 6300 ÷ 25 ÷ 4 = 24 × 25 × 4 = 125 × 18 × 8 = 2000 ÷ 8 ÷ 125 = 2 × 125 × 8 =96 × 25 × 4 =11000 ÷ 25 ÷ 4 =练习范围:乘法交换律和结合 律 题数: 100姓名:成绩:月 日分 秒8 × 125 × 8 =16000 ÷ 8 ÷ 125 =17 × 25 × 4 = 13000 ÷ 8 ÷ 125 =6700 ÷ 25 ÷ 4 = 4 × 125 × 8 = 11000 ÷ 4 ÷ 25 =4000 ÷ 25 ÷ 4 =125 × 19 × 8 = 3000 ÷ 125 ÷ 8 =9600 ÷ 25 ÷ 4 = 3 × 125 × 8 = 3000 ÷ 25 ÷ 4 =25 × 34 × 4 =25 × 98 × 4 =52 × 25 × 4 =25 × 59 × 4 =4000 ÷ 8 ÷ 125 = 15000 ÷ 4 ÷ 25 =25 × 43 × 4 =1700 ÷ 25 ÷ 4 = 1000 ÷ 4 ÷ 25 =25 × 60 × 4 =18 × 125 × 8 = 56 × 25 × 4 =7100 ÷ 25 ÷ 4 =19000 ÷ 125 ÷ 8 = 2000 ÷ 4 ÷ 25 =6000 ÷ 4 ÷ 25 =1600 ÷ 25 ÷ 4 = 11 × 25 × 4 =8400 ÷ 25 ÷ 4 =25 × 73 × 4 = 7000 ÷ 125 ÷ 8 =7000 ÷ 4 ÷ 25 = 6 × 25 × 4 = 9100 ÷ 25 ÷ 4 =19000 ÷ 4 ÷ 25 =17 × 125 × 8 = 9000 ÷ 125 ÷ 8 =19 × 125 × 8 =25 × 5 × 4 =25 × 12 × 4 =20000 ÷ 4 ÷ 25 =125 × 5 × 8 = 10000 ÷ 8 ÷ 125 =54 × 25 × 4 =25 × 91 × 4 = 14000 ÷ 4 ÷ 25 =125 × 4 × 8 =25 × 92 × 4 =25 × 26 × 4 = 4 × 25 × 4 =16000 ÷ 125 ÷ 8 = 15 × 25 × 4 =10 × 125 × 8 = 28 × 25 × 4 = 6500 ÷ 25 ÷ 4 = 10000 ÷ 25 ÷ 4 = 17000 ÷ 4 ÷ 25 = 15 × 125 × 8 = 12000 ÷ 125 ÷ 8 = 125 × 16 × 8 = 125 × 20 × 8 = 14000 ÷ 25 ÷ 4 = 8200 ÷ 25 ÷ 4 = 16 × 125 × 8 = 200 ÷ 25 ÷ 4 = 125 × 14 × 8 = 25 × 48 × 4 = 9 × 125 × 8 = 125 × 6 × 8 = 25 × 36 × 4 = 125 × 5 × 8 = 125 × 18 × 8 = 25 × 79 × 4 = 25 × 60 × 4 = 125 × 4 × 8 = 25 × 32 × 4 = 3000 ÷ 4 ÷ 25 = 25 × 61 × 4 = 125 × 7 × 8 = 74 × 25 × 4 = 125 × 19 × 8 = 8000 ÷ 8 ÷ 125 = 72 × 25 × 4 = 800 ÷ 25 ÷ 4 = 8 × 25 × 4 = 19 × 125 × 8 = 25 × 59 × 4 = 125 × 9 × 8 = 3000 ÷ 25 ÷ 4 = 5 × 125 × 8 = 2 × 125 × 8 = 6 × 125 × 8 = 25 × 92 × 4 = 4 × 125 × 8 = 1900 ÷ 25 ÷ 4 =6000 ÷ 125 ÷ 8 =13000 ÷ 4 ÷ 25 =练习范围:乘法交换律和结合 律 题数: 100姓名:成绩:月 日分 秒125 × 10 × 8 =2000 ÷ 4 ÷ 25 =17 × 25 × 4 = 15000 ÷ 125 ÷ 8 =15000 ÷ 4 ÷ 25 =17 × 125 × 8 = 7000 ÷ 25 ÷ 4 =10000 ÷ 8 ÷ 125 =25 × 40 × 4 =20 × 125 × 8 =8000 ÷ 4 ÷ 25 =125 × 13 × 8 = 18 × 25 × 4 =18 × 125 × 8 =4000 ÷ 125 ÷ 8 = 4000 ÷ 25 ÷ 4 =1000 ÷ 8 ÷ 125 =7300 ÷ 25 ÷ 4 = 1000 ÷ 125 ÷ 8 =12000 ÷ 8 ÷ 125 =19000 ÷ 125 ÷ 8 = 77 × 25 × 4 =67 × 25 × 4 =7000 ÷ 8 ÷ 125 = 5000 ÷ 125 ÷ 8 =25 × 39 × 4 =6000 ÷ 8 ÷ 125 = 125 × 12 × 8 =15000 ÷ 8 ÷ 125 =25 × 58 × 4 = 16000 ÷ 8 ÷ 125 =20000 ÷ 4 ÷ 25 =25 × 43 × 4 = 7000 ÷ 125 ÷ 8 =25 × 89 × 4 =25 × 99 × 4 =12 × 25 × 4 =25 × 26 × 4 =5100 ÷ 25 ÷ 4 = 5900 ÷ 25 ÷ 4 =25 × 52 × 4 =19000 ÷ 8 ÷ 125 = 25 × 17 × 4 =24 × 25 × 4 =18000 ÷ 125 ÷ 8 = 25 × 16 × 4 =2400 ÷ 25 ÷ 4 =16000 ÷ 125 ÷ 8 = 6000 ÷ 4 ÷ 25 =12 × 125 × 8 =25 × 73 × 4 =25 × 66 × 4 =3000 ÷ 125 ÷ 8 =25 × 34 × 4 =3 × 125 × 8 =13000 ÷ 8 ÷ 125 = 25 × 79 × 4 = 25 × 23 × 4 = 125 × 5 × 8 = 8000 ÷ 4 ÷ 25 = 40 × 25 × 4 = 17 × 25 × 4 = 5000 ÷ 125 ÷ 8 = 25 × 48 × 4 = 125 × 16 × 8 = 25 × 43 × 4 = 25 × 59 × 4 = 19000 ÷ 125 ÷ 8 = 6000 ÷ 4 ÷ 25 = 25 × 52 × 4 = 87 × 25 × 4 = 125 × 19 × 8 = 25 × 19 × 4 = 2000 ÷ 25 ÷ 4 = 7000 ÷ 125 ÷ 8 = 17000 ÷ 8 ÷ 125 = 17000 ÷ 25 ÷ 4 = 51 × 25 × 4 = 9000 ÷ 125 ÷ 8 = 5600 ÷ 25 ÷ 4 = 12 × 25 × 4 = 8 × 125 × 8 = 25 × 40 × 4 = 9300 ÷ 25 ÷ 4 = 8200 ÷ 25 ÷ 4 = 10000 ÷ 8 ÷ 125 = 38 × 25 × 4 = 3000 ÷ 25 ÷ 4 = 5 × 25 × 4 = 14 × 125 × 8 = 125 × 9 × 8 = 25 × 26 × 4 = 19000 ÷ 4 ÷ 25 = 12 × 125 × 8 = 16000 ÷ 4 ÷ 25 = 5000 ÷ 25 ÷ 4 = 25 × 73 × 4 = 17000 ÷ 4 ÷ 25 =18000 ÷ 125 ÷ 8 =800 ÷ 25 ÷ 4 =练习范围:乘法交换律和结合 律 题数: 100姓名:成绩:月 日分 秒125 × 4 × 8 =2800 ÷ 25 ÷ 4 =7000 ÷ 25 ÷ 4 = 19000 ÷ 8 ÷ 125 =26 × 25 × 4 =3000 ÷ 125 ÷ 8 = 25 × 27 × 4 =84 × 25 × 4 =12000 ÷ 125 ÷ 8 = 25 × 58 × 4 =4500 ÷ 25 ÷ 4 =3600 ÷ 25 ÷ 4 = 11000 ÷ 25 ÷ 4 =20 × 125 × 8 =77 × 25 × 4 =46 × 25 × 4 =13000 ÷ 125 ÷ 8 =18 × 25 × 4 = 10000 ÷ 4 ÷ 25 =9500 ÷ 25 ÷ 4 =24 × 25 × 4 = 125 × 12 × 8 =15000 ÷ 8 ÷ 125 =15 × 125 × 8 = 13 × 125 × 8 =4000 ÷ 25 ÷ 4 =74 × 25 × 4 =25 × 34 × 4 =5900 ÷ 25 ÷ 4 =125 × 20 × 8 = 17 × 125 × 8 =11000 ÷ 8 ÷ 125 =8 × 25 × 4 = 15000 ÷ 125 ÷ 8 =8000 ÷ 125 ÷ 8 =18 × 125 × 8 = 25 × 70 × 4 =8600 ÷ 25 ÷ 4 = 4 × 125 × 8 = 10000 ÷ 25 ÷ 4 =6400 ÷ 25 ÷ 4 =25 × 45 × 4 =96 × 25 × 4 =72 × 25 × 4 =9 × 25 × 4 =42 × 25 × 4 =19000 ÷ 25 ÷ 4 =16000 ÷ 125 ÷ 8 = 25 × 5 × 4 =7800 ÷ 25 ÷ 4 =25 × 91 × 4 =125 × 2 × 8 =71 × 25 × 4 = 3000 ÷ 4 ÷ 25 =7000 ÷ 4 ÷ 25 =3000 ÷ 125 ÷ 8 = 25 × 33 × 4 = 14000 ÷ 125 ÷ 8 = 7000 ÷ 4 ÷ 25 = 2000 ÷ 8 ÷ 125 = 6200 ÷ 25 ÷ 4 = 25 × 75 × 4 = 2600 ÷ 25 ÷ 4 = 25 × 44 × 4 = 125 × 18 × 8 = 25 × 48 × 4 = 12 × 25 × 4 = 2000 ÷ 125 ÷ 8 = 8800 ÷ 25 ÷ 4 = 13 × 125 × 8 = 85 × 25 × 4 = 7000 ÷ 125 ÷ 8 = 18000 ÷ 8 ÷ 125 = 87 × 25 × 4 = 62 × 25 × 4 = 19000 ÷ 125 ÷ 8 = 6700 ÷ 25 ÷ 4 = 25 × 58 × 4 = 3900 ÷ 25 ÷ 4 = 96 × 25 × 4 = 19 × 125 × 8 = 8000 ÷ 125 ÷ 8 = 12000 ÷ 125 ÷ 8 = 74 × 25 × 4 = 13000 ÷ 4 ÷ 25 = 19000 ÷ 4 ÷ 25 = 1000 ÷ 8 ÷ 125 = 4 × 125 × 8 = 8 × 25 × 4 = 7500 ÷ 25 ÷ 4 = 7000 ÷ 8 ÷ 125 = 25 × 92 × 4 = 42 × 25 × 4 = 12 × 125 × 8 = 12000 ÷ 8 ÷ 125 = 6 × 125 × 8 = 125 × 8 × 8 = 125 × 20 × 8 =7 × 125 × 8 =25 × 32 × 4 =练习范围:乘法交换律和结合 律 题数: 100姓名:成绩:月 日分 秒5000 ÷ 25 ÷ 4 =58 × 25 × 4 =4000 ÷ 125 ÷ 8 = 10 × 125 × 8 =11000 ÷ 125 ÷ 8 =25 × 12 × 4 = 6000 ÷ 125 ÷ 8 =11000 ÷ 8 ÷ 125 =25 × 13 × 4 = 7000 ÷ 25 ÷ 4 =25 × 49 × 4 =125 × 11 × 8 = 14 × 25 × 4 =17000 ÷ 125 ÷ 8 =25 × 35 × 4 = 8200 ÷ 25 ÷ 4 =17000 ÷ 8 ÷ 125 =20 × 125 × 8 = 11 × 125 × 8 =6000 ÷ 4 ÷ 25 =25 × 2 × 4 =125 × 7 × 8 =125 × 4 × 8 =10000 ÷ 8 ÷ 125 = 125 × 9 × 8 =16 × 125 × 8 =32 × 25 × 4 = 5000 ÷ 125 ÷ 8 =25 × 28 × 4 =8000 ÷ 8 ÷ 125 = 54 × 25 × 4 =6100 ÷ 25 ÷ 4 =125 × 12 × 8 = 77 × 25 × 4 =29 × 25 × 4 =25 × 66 × 4 =66 × 25 × 4 =25 × 76 × 4 =25 × 5 × 4 =15 × 125 × 8 =78 × 25 × 4 =10000 ÷ 25 ÷ 4 = 1000 ÷ 4 ÷ 25 =52 × 25 × 4 =25 × 60 × 4 =17 × 25 × 4 =14000 ÷ 8 ÷ 125 =18000 ÷ 125 ÷ 8 = 6400 ÷ 25 ÷ 4 =11000 ÷ 4 ÷ 25 =8000 ÷ 4 ÷ 25 =2000 ÷ 4 ÷ 25 =3000 ÷ 4 ÷ 25 = 1000 ÷ 125 ÷ 8 =125 × 5 × 8 =1000 ÷ 125 ÷ 8 = 18000 ÷ 125 ÷ 8 = 24 × 25 × 4 = 6 × 125 × 8 = 125 × 13 × 8 = 3 × 25 × 4 = 6000 ÷ 8 ÷ 125 = 18000 ÷ 8 ÷ 125 = 25 × 59 × 4 = 80 × 25 × 4 = 18 × 25 × 4 = 4 × 125 × 8 = 12000 ÷ 125 ÷ 8 = 17 × 125 × 8 = 1000 ÷ 4 ÷ 25 = 67 × 25 × 4 = 64 × 25 × 4 = 25 × 34 × 4 = 46 × 25 × 4 = 5600 ÷ 25 ÷ 4 = 5 × 25 × 4 = 25 × 4 × 4 = 16000 ÷ 125 ÷ 8 = 125 × 9 × 8 = 25 × 73 × 4 = 11000 ÷ 4 ÷ 25 = 65 × 25 × 4 = 25 × 49 × 4 = 125 × 6 × 8 = 16000 ÷ 8 ÷ 125 = 7000 ÷ 4 ÷ 25 = 19 × 125 × 8 = 25 × 12 × 4 = 5000 ÷ 125 ÷ 8 = 8000 ÷ 125 ÷ 8 = 17000 ÷ 8 ÷ 125 = 3000 ÷ 125 ÷ 8 = 12 × 25 × 4 = 125 × 4 × 8 = 88 × 25 × 4 = 92 × 25 × 4 = 10000 ÷ 25 ÷ 4 = 87 × 25 × 4 =2600 ÷ 25 ÷ 4 =125 × 2 × 8 =练习范围:乘法交换律和结合 律 题数: 100姓名:成绩:月 日分 秒25 × 66 × 4 =34 × 25 × 4 =23 × 25 × 4 = 85 × 25 × 4 =1000 ÷ 8 ÷ 125 =28 × 25 × 4 = 5000 ÷ 8 ÷ 125 =25 × 43 × 4 =125 × 7 × 8 = 20000 ÷ 25 ÷ 4 =13000 ÷ 8 ÷ 125 =8000 ÷ 4 ÷ 25 = 16 × 125 × 8 = 3 × 125 × 8 =1000 ÷ 25 ÷ 4 = 19000 ÷ 125 ÷ 8 =54 × 25 × 4 =125 × 15 × 8 = 25 × 40 × 4 =18000 ÷ 4 ÷ 25 =2500 ÷ 25 ÷ 4 = 9 × 125 × 8 =7000 ÷ 8 ÷ 125 =12 × 125 × 8 = 91 × 25 × 4 =16000 ÷ 4 ÷ 25 =125 × 19 × 8 = 12000 ÷ 4 ÷ 25 =3900 ÷ 25 ÷ 4 =3000 ÷ 25 ÷ 4 = 6400 ÷ 25 ÷ 4 =62 × 25 × 4 =8 × 125 × 8 = 25 × 92 × 4 =20000 ÷ 4 ÷ 25 =25 × 79 × 4 = 25 × 38 × 4 =3000 ÷ 4 ÷ 25 =7000 ÷ 25 ÷ 4 = 7000 ÷ 125 ÷ 8 =25 × 91 × 4 =4300 ÷ 25 ÷ 4 = 10000 ÷ 4 ÷ 25 =99 × 25 × 4 =9000 ÷ 125 ÷ 8 = 17 × 25 × 4 =19000 ÷ 4 ÷ 25 =25 × 27 × 4 = 6700 ÷ 25 ÷ 4 =14000 ÷ 125 ÷ 8 =125 × 11 × 8 = 25 × 48 × 4 =25 × 58 × 4 =14000 ÷ 4 ÷ 25 = 70 × 25 × 4 =125 × 18 × 8 = 24 × 25 × 4 = 25 × 72 × 4 = 18000 ÷ 125 ÷ 8 = 125 × 2 × 8 = 9 × 125 × 8 = 27 × 25 × 4 = 5000 ÷ 125 ÷ 8 = 5400 ÷ 25 ÷ 4 = 6000 ÷ 125 ÷ 8 = 25 × 59 × 4 = 54 × 25 × 4 = 125 × 16 × 8 = 3400 ÷ 25 ÷ 4 = 16 × 125 × 8 = 25 × 79 × 4 = 125 × 19 × 8 = 42 × 25 × 4 = 125 × 8 × 8 = 8 × 25 × 4 = 25 × 40 × 4 = 6000 ÷ 4 ÷ 25 = 3000 ÷ 4 ÷ 25 = 3 × 25 × 4 = 13000 ÷ 8 ÷ 125 = 25 × 36 × 4 = 16000 ÷ 8 ÷ 125 = 12 × 125 × 8 = 4000 ÷ 125 ÷ 8 = 17000 ÷ 125 ÷ 8 = 12000 ÷ 4 ÷ 25 = 5 × 25 × 4 = 6400 ÷ 25 ÷ 4 = 3 × 125 × 8 = 73 × 25 × 4 = 800 ÷ 25 ÷ 4 = 41 × 25 × 4 = 5 × 125 × 8 = 48 × 25 × 4 = 3000 ÷ 125 ÷ 8 = 9000 ÷ 125 ÷ 8 = 25 × 43 × 4 = 15000 ÷ 8 ÷ 125 =68 × 25 × 4 =13 × 125 × 8 =练习范围:乘法交换律和结合 律 题数: 100姓名:成绩:月 日分 秒10000 ÷ 125 ÷ 8 =6000 ÷ 8 ÷ 125 =47 × 25 × 4 =25 × 71 × 4 =1000 ÷ 25 ÷ 4 =25 × 48 × 4 =34 × 25 × 4 =9500 ÷ 25 ÷ 4 =19 × 125 × 8 = 17 × 25 × 4 =10000 ÷ 25 ÷ 4 =8000 ÷ 4 ÷ 25 = 125 × 15 × 8 =10000 ÷ 4 ÷ 25 =67 × 25 × 4 = 125 × 5 × 8 =25 × 74 × 4 =125 × 10 × 8 = 15000 ÷ 125 ÷ 8 =125 × 13 × 8 =11 × 125 × 8 = 25 × 34 × 4 =16 × 25 × 4 =25 × 60 × 4 = 125 × 7 × 8 =19000 ÷ 125 ÷ 8 =8300 ÷ 25 ÷ 4 = 8200 ÷ 25 ÷ 4 =8 × 125 × 8 =12 × 25 × 4 = 3000 ÷ 25 ÷ 4 =17000 ÷ 8 ÷ 125 =14000 ÷ 8 ÷ 125 = 125 × 17 × 8 =6700 ÷ 25 ÷ 4 =84 × 25 × 4 =25 × 80 × 4 =10000 ÷ 8 ÷ 125 =12000 ÷ 8 ÷ 125 = 25 × 75 × 4 =62 × 25 × 4 =9000 ÷ 8 ÷ 125 = 87 × 25 × 4 =125 × 6 × 8 =77 × 25 × 4 =25 × 26 × 4 =25 × 13 × 4 = 6 × 125 × 8 =25 × 92 × 4 =46 × 25 × 4 =7900 ÷ 25 ÷ 4 = 85 × 25 × 4 =125 × 9 × 8 =1000 ÷ 8 ÷ 125 = 25 × 98 × 4 =5 × 125 × 8 = 7000 ÷ 25 ÷ 4 = 9000 ÷ 25 ÷ 4 = 9000 ÷ 125 ÷ 8 = 2000 ÷ 8 ÷ 125 = 74 × 25 × 4 = 6400 ÷ 25 ÷ 4 = 20000 ÷ 125 ÷ 8 = 25 × 66 × 4 = 13 × 125 × 8 = 51 × 25 × 4 = 19000 ÷ 4 ÷ 25 = 12 × 125 × 8 = 25 × 74 × 4 = 6000 ÷ 4 ÷ 25 = 5000 ÷ 8 ÷ 125 = 5600 ÷ 25 ÷ 4 = 62 × 25 × 4 = 25 × 26 × 4 = 125 × 3 × 8 = 25 × 60 × 4 = 25 × 73 × 4 = 46 × 25 × 4 = 25 × 40 × 4 = 25 × 37 × 4 = 5000 ÷ 125 ÷8 = 25 × 35 × 4 = 4000 ÷ 8 ÷ 125 = 6000 ÷ 125 ÷ 8 = 17 × 125 × 8 = 16000 ÷ 125 ÷ 8 = 10000 ÷ 8 ÷ 125 = 34 × 25 × 4 = 5800 ÷ 25 ÷ 4 = 15 × 125 × 8 = 25 × 34 × 4 = 24 × 25 × 4 = 6700 ÷ 25 ÷ 4 = 125 × 16 × 8 = 8 × 25 × 4 = 15000 ÷ 125 ÷ 8 = 25 × 98 × 4 = 77 × 25 × 4 =20 × 125 × 8 =4000 ÷ 125 ÷ 8 =练习范围:乘法交换律和结合 律 题数: 100姓名:成绩:月 日分 秒18 × 125 × 8 =3000 ÷ 4 ÷ 25 =25 × 43 × 4 =25 × 91 × 4 =3000 ÷ 125 ÷ 8 =90 × 25 × 4 = 16000 ÷ 4 ÷ 25 =7000 ÷ 8 ÷ 125 =15000 ÷ 8 ÷ 125 = 18000 ÷ 125 ÷ 8 =2000 ÷ 4 ÷ 25 = 4 × 125 × 8 =87 × 25 × 4 =12000 ÷ 8 ÷ 125 =800 ÷ 25 ÷ 4 = 10000 ÷ 125 ÷ 8 =25 × 88 × 4 =19 × 125 × 8 = 16 × 25 × 4 =125 × 2 × 8 =125 × 14 × 8 = 6100 ÷ 25 ÷ 4 =96 × 25 × 4 =7000 ÷ 125 ÷ 8 = 25 × 75 × 4 =300 ÷ 25 ÷ 4 =11000 ÷ 4 ÷ 25 = 7800 ÷ 25 ÷ 4 =125 × 5 × 8 =55 × 25 × 4 =25 × 92 × 4 =25 × 6 × 4 =7 × 125 × 8 =18 × 25 × 4 =25 × 48 × 4 =125 × 7 × 8 =11 × 125 × 8 =1000 ÷ 4 ÷ 25 =125 × 17 × 8 = 85 × 25 × 4 =1000 ÷ 8 ÷ 125 =3300 ÷ 25 ÷ 4 = 25 × 12 × 4 =16000 ÷ 8 ÷ 125 =25 × 50 × 4 = 125 × 6 × 8 =125 × 10 × 8 =6000 ÷ 25 ÷ 4 = 38 × 25 × 4 =12000 ÷ 4 ÷ 25 =2000 ÷ 125 ÷ 8 = 6 × 125 × 8 =25 × 2 × 4 =2300 ÷ 25 ÷ 4 = 19000 ÷ 8 ÷ 125 =6000 ÷ 125 ÷ 8 = 10 × 125 × 8 = 1000 ÷ 4 ÷ 25 = 96 × 25 × 4 = 18 × 125 × 8 = 27 × 25 × 4 = 16000 ÷ 8 ÷ 125 = 1100 ÷ 25 ÷ 4 = 7000 ÷ 125 ÷ 8 = 9000 ÷ 125 ÷ 8 = 25 × 46 × 4 = 25 × 40 × 4 = 6000 ÷ 4 ÷ 25 = 5600 ÷ 25 ÷ 4 = 20000 ÷ 25 ÷ 4 = 125 × 11 × 8 = 25 × 53 × 4 = 52 × 25 × 4 = 83 × 25 × 4 = 25 × 48 × 4 = 125 × 15 × 8 = 13 × 125 × 8 = 100 ÷ 25 ÷ 4 = 98 × 25 × 4 = 7000 ÷ 25 ÷ 4 = 18000 ÷ 125 ÷ 8 = 25 × 24 × 4 = 15000 ÷ 8 ÷ 125 = 24 × 25 × 4 = 1000 ÷ 125 ÷ 8 = 25 × 59 × 4 = 25 × 55 × 4 = 15 × 125 × 8 = 6400 ÷ 25 ÷ 4 = 8 × 25 × 4 = 54 × 25 × 4 = 25 × 67 × 4 = 16000 ÷ 4 ÷ 25 = 25 × 91 × 4 = 10000 ÷ 25 ÷ 4 = 25 × 34 × 4 = 2000 ÷ 125 ÷ 8 = 125 × 9 × 8 =1000 ÷ 8 ÷ 125 =125 × 10 × 8 =练习范围:乘法交换律和结合 律 题数: 100姓名:成绩:月 日分 秒3000 ÷ 4 ÷ 25 =34 × 25 × 4 =3400 ÷ 25 ÷ 4 = 25 × 61 × 4 =125 × 12 × 8 =25 × 66 × 4 = 19000 ÷ 125 ÷ 8 =3000 ÷ 125 ÷ 8 =4000 ÷ 8 ÷ 125 = 9200 ÷ 25 ÷ 4 =25 × 79 × 4 =7000 ÷ 8 ÷ 125 = 5000 ÷ 8 ÷ 125 =62 × 25 × 4 =16 × 125 × 8 = 14 × 25 × 4 =25 × 56 × 4 =5000 ÷ 4 ÷ 25 = 19000 ÷ 4 ÷ 25 =25 × 73 × 4 =7800 ÷ 25 ÷ 4 = 25 × 20 × 4 =25 × 76 × 4 = 6 × 125 × 8 = 7000 ÷ 4 ÷ 25 =85 × 25 × 4 =125 × 16 × 8 = 8 × 125 × 8 =9000 ÷ 4 ÷ 25 =25 × 75 × 4 =17 × 25 × 4 =125 × 19 × 8 = 5 × 125 × 8 =18 × 25 × 4 =11000 ÷ 125 ÷ 8 =25 × 58 × 4 = 125 × 4 × 8 =25 × 95 × 4 =25 × 81 × 4 = 10000 ÷ 4 ÷ 25 =12000 ÷ 4 ÷ 25 =25 × 60 × 4 = 17 × 125 × 8 =11000 ÷ 4 ÷ 25 =87 × 25 × 4 = 18000 ÷ 4 ÷ 25 =3000 ÷ 25 ÷ 4 =125 × 5 × 8 = 25 × 52 × 4 =8200 ÷ 25 ÷ 4 = 5 × 25 × 4 =42 × 25 × 4 =600 ÷ 25 ÷ 4 = 8000 ÷ 125 ÷ 8 =14000 ÷ 4 ÷ 25 =19 × 125 × 8 = 19000 ÷ 125 ÷ 8 = 54 × 25 × 4 = 125 × 16 × 8 = 3000 ÷ 125 ÷ 8 = 25 × 82 × 4 = 125 × 10 × 8 = 66 × 25 × 4 = 34 × 25 × 4 = 3700 ÷ 25 ÷ 4 = 25 × 56 × 4 = 15 × 125 × 8 = 14 × 25 × 4 = 6000 ÷ 8 ÷ 125 = 125 × 19 × 8 = 25 × 40 × 4 = 13 × 125 × 8 = 3900 ÷ 25 ÷ 4 = 14000 ÷ 8 ÷ 125 = 8700 ÷ 25 ÷ 4 = 9000 ÷ 25 ÷ 4 = 16000 ÷ 8 ÷ 125 = 24 × 25 × 4 = 2000 ÷ 4 ÷ 25 = 1000 ÷ 125 ÷ 8 = 25 × 92 × 4 = 18000 ÷ 125 ÷ 8 = 6600 ÷ 25 ÷ 4 = 18000 ÷ 4 ÷ 25 = 7800 ÷ 25 ÷ 4 = 14000 ÷ 4 ÷ 25 = 87 × 25 × 4 = 5 × 25 × 4 = 15000 ÷ 8 ÷ 125 = 25 × 43 × 4 = 7700 ÷ 25 ÷ 4 = 800 ÷ 25 ÷ 4 = 5000 ÷ 125 ÷ 8 = 46 × 25 × 4 = 125 × 5 × 8 = 7000 ÷ 25 ÷ 4 = 13000 ÷ 8 ÷ 125 = 25 × 98 × 4 =67 × 25 × 4 =125 × 15 × 8 =练习范围:乘法交换律和结合 律 题数: 100姓名:成绩:月 日分 秒6700 ÷ 25 ÷ 4 =125 × 4 × 8 =39 × 25 × 4 =16 × 125 × 8 =125 × 3 × 8 =6000 ÷ 125 ÷ 8 = 1000 ÷ 4 ÷ 25 =125 × 12 × 8 =12 × 125 × 8 = 19000 ÷ 8 ÷ 125 =19000 ÷ 4 ÷ 25 =7000 ÷ 8 ÷ 125 = 25 × 66 × 4 =19 × 25 × 4 =12000 ÷ 125 ÷ 8 = 25 × 78 × 4 =8400 ÷ 25 ÷ 4 =5000 ÷ 8 ÷ 125 = 25 × 58 × 4 =4400 ÷ 25 ÷ 4 =17000 ÷ 4 ÷ 25 = 13000 ÷ 4 ÷ 25 =25 × 73 × 4 =7 × 125 × 8 = 9000 ÷ 125 ÷ 8 =4100 ÷ 25 ÷ 4 =10000 ÷ 25 ÷ 4 = 63 × 25 × 4 =96 × 25 × 4 =125 × 11 × 8 = 18 × 25 × 4 =125 × 8 × 8 =25 × 34 × 4 = 13000 ÷ 125 ÷ 8 =8000 ÷ 125 ÷ 8 =83 × 25 × 4 =29 × 25 × 4 =4300 ÷ 25 ÷ 4 =6000 ÷ 4 ÷ 25 = 8 × 125 × 8 =25 × 75 × 4 =25 × 59 × 4 =17 × 25 × 4 =20000 ÷ 8 ÷ 125 =6400 ÷ 25 ÷ 4 = 74 × 25 × 4 =25 × 49 × 4 =25 × 48 × 4 =3 × 125 × 8 =25 × 93 ×4 =7000 ÷ 4 ÷ 25 = 125 × 13 × 8 = 5 × 125 × 8 =200 ÷ 25 ÷ 4 = 125 × 2 × 8 =。
第三单元乘法交换律和结合律练习
第三单元乘法交换律和结合律练习It was last revised on January 2, 2021乘法交换律和结合律练习(做前必读)要想运用运算定律做好简便运算,要注意以下几点:1、要仔细观察算式,如果算式里只有乘法,一般用到乘法交换和结合律,如果只有加法,一般用到加法交换和结合律,如果既有加又有乘,一般用到乘法分配律。
当然要注意一些变式。
2、还要观察算式里面的特殊数字,如25和4,125和8,2和5等,有时101可以变成(100+1),想想如何利用好这些特殊数字。
3、要熟练掌握运算定律的字母表示形式,并注意多动脑思考。
简便运算越做越有趣,祝大家学得开心。
综合练习一(1)乘法交换律:a×b=b×a 乘法结合律:(a×b)×c=a×(b×c)38×25×4 42×125×8 25×17×4 (25×125)×(8×4) 49×4×538×125×8×3 (125×25)×4 5 ×289×2 (125×12)×8 125×(12×4)(2) 乘法交换律和结合律的变化练习125×64 125×88 44×25 125×24 25×28(3)加法交换律:a+b=b+a 加法结合律:(a+b)+c=a+(b+c)357+288+143 158+395+105 167+289+33 129+235+171+165378+527+73 169+78+22 58+39+42+61 138+293+62+107(25×125)×(8×4)(4+8)×25 35×37+65×37135×6+65×6 (43+25)×40 8×(125+7)18×82+18×47+18×712 5×(40-4)16×256-16×56125×(80+8) 69×45+31×45 38×29+38123×99 +123 125 ×7+125 79 ×99+7935×102 47×101 25×4445×201-45 98×37 38×101-3887×199 25×199+25 25×19999×201-99 102×83 125×88124×25-25×24 (80+8)×25 35×37+65×37 135×6+65×6 (43+25)×40 8×(125+7)18×82+18×47+18×71 4×24+26×24 30×2+25×2 299 ×120+120 38×25×4? 8×17×1254×8×25×12535×2×5=35×(2×)(60×25)×4=60×( ×)125×5×8=( ×)×5125×32 (8×125)×(4×25) 8×4×125×25125×8×825×6×4 125×8×4 64×125 (25×4)×6125×16 16×25 42×125×827×4×58×(7×25)25×12195×25×4 2×125×8×5 125×489×4综合练习二一、用简便方法计算下面各题23×15×2 125×7×8 250×56×4 75×9×220×17×2×5×2×2 110×2+90×2? (110+90)×212×105 (30×25)×40 44×25×8 98×21748×125 28×16 25×12 125×32 125×24 二、在□里填上适当的数35×8=35×(□×□) 45×12=45×(□×□)16×15=16×(□×□) 18×25=18×(□×□)125×32=125×(□×□) 25×24=25×(□×□)三、判断18×12×5=18×(12×5),这应用了乘法结合律。
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乘法交换律和结合律练习题
一、仔细想,认真填
1、两个数相加,交换加数的,和不变,这叫做。
用字母表示为。
2、三个数相加,先把相加,再与相加;或者先把相加,再与相
加,它们的和不变,这叫做。
用字母表示为。
3、两个数相乘,交换乘数的,积不变,这叫做。
用字母表示
为。
4、三个数相乘,先把相乘,再与相乘;或者先把相乘,再与相乘,
它们的积不变,这叫做。
用字母表示为。
5、73+99+27=99+(73+27) 是根据加法( )律和( )律;
9×125×8 =9×(125×8),这里运用了乘法( )律;
(25×37)×4=37×(25×4)。
这里运用了乘法( )律和( )律。
6、在○里填>、<或=符号。
125×24○125×8×3 27×4×25○27×(4×25) 67×8○68×7
7、在□内填上数,在○内填上运算符号,在横线上填上运用的运算定律。
29+37+171=37+(□○□)。
42×5×8=42×(□○□)。
47+□=28○□。
427+39+73=(427+□)○□。
35×21×2=21×(□○□)。
8、计算64×26后,可以交换两个乘数的位置进行验算,是运用了()律。
9、25×(20×39)=(25×20)×39 这是运用了()律。
10、用简便方法计算76+98+24,要先算(),这是根据()律。
二、对号入座:(把正确的答案的序号填在括号里)
1、下面一个零也不读的数是( )。
A.600030 B.603000 C.600300
2、与480×40的积一样的算式是( )。
A.48×40 B.480×400 C.48×400
3、用两个4和三个0可以组成( )个不同的五位数。
A.3 B.4 C.5
4、32+29+68+41=32+68+(29+41)这是根据( )。
A.加法交换律
B.加法结合律
C.加法交换律和结合律
5、49×25×4=49×(25×4)这是根据( )。
A.乘法交换律 B.乘法分配律 C.乘法结合律
6、下面算式中( )运用了乘法交换律和结合律。
A、(47×5)×12=47×(5×12)
B、a×b×a×c=a×(b×c)
C、4×a×5=a×(4×5)
三、计算
1、口算我最棒。
50×70= 40×30= 25×40= 160×3= 24×2=60×40= 200×7= 12×30= 22×40= 25×2=25×20= 48×20= 300×50= 180×6= 80—15=12×3= 320×3= 25×4= 50×2=210÷7=90×0= 30÷5= 200÷4= 18×4=125×37×8=598+99= 396—28—22= 369+43+57= 27×16+73×16=2、笔算下面各题。
列竖式计算。
128×46= 403×24= 130×35= 42×102= 308×32= 259×34= 20×369= 480×70=
四、用简便方法计算。
44+37+56 168+49+61 125×23×8 25×23×4 74+(137+326) 189+35+211+165 94+38+106+62 25×36×4 65×5×2 125×15×8 125×24 25×36
五、怎样简便就怎样算;
(1)127+352+73 (2)244+89+111 (3)26+71+74+29 (4)35×125×8 (5)97×25×4(6)125×18×8 (7)36×25(8)25×64×125 (9)44×25
六、用线段连一连
①35×2×5 A:18×(25×4)
②18×25×4 B:35×(2×5)
③22×30×44 C:60×30×20
④60×(20×30) D:22×(30×44)
⑤326×50×8 E:(42+68)+(99+1)
⑥42+99+68+1 F:326×(50×8)
七、根据运算定律,在□里填上适当的数。
(1)a+(30+8)=(□+□)+8
(2)□+28=□+18
(3)45×□=32×□
(4)(4+8)×25=□×□+□×□这题你会吗?。