20以内的进位加法

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20以内进位加减法

20以内进位加减法

20以内进位加减法20以内进位加法:方法一:“凑十法”(强调:看大数,分小数,凑成十,加剩数)8+5=8+2+3=13;方法二:“五五凑十”( 当两个加数都大于且接近5时适用) 6+7=5+5+1+2=13;方法三:“多加减补”8+5=10+5-2=13.20以内进位加法“凑十法”、“凑小数,拆大数”,将小数凑成10,然后再计算。

如: 3+9 (3+7=10,9可以分成7和2,10+2=12)凑大数,拆小数”,将大数凑成10,然后再计算。

如: 8+7 (8+2=10,7可以分成2和5,10+5=15)整数加法计算法则:相同数位对齐,从低位加起,哪-一位上的数相加满十,就向前一位进一。

整数减法计算法则:相同数位对齐,从低位加起,哪一位上的数不够减,就从它的前一位退一作十,和本位上的数合并在一起,再减。

例题加减混合运算2+6+2= 5+3+2= 4+0+3= 10—3—7= 9—3—6= 10—1—4= 7—2+4= 8+2—6= 10—4+3= 3+6—8= 一、10以内的加减法0+6=0+0=1+2=1+9=10-8=2+3=2+8=4--3=3+6=5-1=6-4=4+6=9-0=5+5=6+2=7+2=7+3=8+1=9-2=9-7=8-1=8-5=8-7=7-3=7-5=3+1=5-4=3+3=3-1=4+4=二、求未知加数2+()=10 4+()=8 5+()=109+()=9 3+()=7 ()+6=10 ()+3=9 ()+1=10 ()+7=10 ()+9=10三、连加17-10= 16-1= 16-2= 16-3= 16-4=1+11= 1+12= 1+13= 1+14= 1+15=20-10= 19-1= 19-2= 19-3= 19-4=18-5= 18-6= 18-7= 18-8= 18-9=17-5= 17-6= 17-7= 17-8= 17-9=6-2= 6-3= 6-4= 6-5= 6-6=16-10= 15-1= 15-2= 15-3= 15-4=15-10= 14-1= 14-2= 14-3= 14-4= 1+16= 1+17= 1+18= 1+19= 2+0= 19-5= 19-6= 19-7= 19-8= 19-9=2+12= 2+13= 2+14= 2+15= 2+16= 15-5= 15-6= 15-7= 15-8= 15-9= 18-10= 17-1= 17-2= 17-3= 17-4= 2+17= 2+18= 3+3= 3+4= 3+5= 19-10= 18-1= 18-2= 18-3= 18-4= 3+16= 3+17= 4+4= 4+5= 4+6=13-5= 13-6= 13-7= 13-8= 13-9=13-10= 12-1= 12-2= 12-4= 12-5= 4+12= 4+13= 4+14= 4+15= 4+16= 11-1= 11-2= 11-3= 11-4= 11-5=5+5= 5+6= 5+7= 5+8= 5+9=8-7= 8-8= 7-1= 7-2= 7-3=。

《整理20以内的进位加法》课件

《整理20以内的进位加法》课件

7 + 9 = 16 7 + 5 = 12 8 + 8 = 16
4 在 里填上>、<或=。
8 + 3 < 12
6 + 8 > 12 7 + 6 = 13
7 + 8 > 14
7 + 7 = 14 10 + 6 > 13
5 直接写得数。
7+9+2=18 3+6+5=14
4+8+2=14 7+3+5=15
4+7 3+8 2+9 4+8 3+9 4+9
竖着看依次是9加几、8加几、7 加几、6加几……
9+2 9+3 9+4 9+5 9+6 9+7 9+8 9+9
8+3 8+4 8+5 8+6 8+7 8+8 8+9
7+4 7+5 7+6 7+7 7+8 7+9
6+5 5+6 6+6 5+7 6+7 5+8 6+8 5+9 6+9
4+7 3+8 2+9 4+8 3+9 4+9
斜着看,从左下到右上,加号 前面的数依次减1,加号后面的 数不变,所以得数也依次减1。
9+2 9+3 9+4 9+5 9+6 9+7 9+8 9+9
8+3 8+4 8+5 8+6 8+7 8+8 8+9
7+4 7+5 7+6 7+7 7+8 7+9
6+5 5+6 6+6 5+7 6+7 5+8 6+8 5+9 6+9
《整理20以内的进位加法》
1.通过小组合作整理、交流,能把20以内的加法算式有规律地 整理在加法表中。 2.在教师的指导下,能够发现20以内加法表中的规律。 3.鼓励学生积极参与小组合作学习,体验到成功的乐趣,增强 学习数学的信心。

20以内进位加法解读

20以内进位加法解读

20以内进位加法解读一、引言进位加法是我们日常生活中经常使用的一种加法运算方法。

本文将详细介绍20以内的进位加法,并解读其中的原理和应用。

二、什么是进位加法?进位加法是指在两个或多个数相加的过程中,当相加的两位数(或更多位数)的和大于等于进制规定的进位值时,需要将进位值加到前一位上,并将当前位的和取余(模)进制规定的数,形成新的位数的加法运算。

在20进制下,当相加的两位数之和大于等于20时,需要进行进位操作。

三、进位加法的原理进位加法的原理可以通过以下步骤来理解:1.从最低位开始,将相应位的数相加。

2.如果和小于20,则直接写下该和,并进入下一位数相加。

3.如果和大于等于20,则需要进行进位操作:将该位的和减去20,并记录进位值为1。

4.将进位值加到前一位数上,并继续下一位数相加。

5.重复以上步骤,直至所有位数相加完毕。

四、进位加法的计算步骤示例下面通过一个具体的例子来演示20以内的进位加法的计算步骤:假设我们需要计算以下两个数的和:13+81.从最低位开始相加:3+8=11。

2.由于和大于等于20,需要进行进位操作:11-20=11(本位的和减去20),并记录进位值为1。

3.进位值1加到前一位数上:1+1=2(十位的和)。

4.最终结果为2(十位的和)1(个位的和),即21。

五、进位加法的应用场景进位加法广泛应用于日常生活中。

以下是一些常见的应用场景:1.购物结算:当我们购买多件商品时,需要将每件商品的价格相加,进位加法可用于计算总价格。

2.时间计算:当我们计算时间差或者时间相加时,可以使用进位加法来处理小时、分钟和秒的进位情况。

3.学习成绩计算:当我们计算多门学科的成绩总和时,进位加法可用于计算总分数。

通过以上几个应用场景的解读,可以看出进位加法在我们生活中的普遍性和重要性。

六、总结进位加法是一种常用的加法运算方法,尤其在20以内的计算中更加常见。

本文介绍了进位加法的原理、计算步骤示例以及几个常见的应用场景。

20以内进位加法100题(30套)

20以内进位加法100题(30套)

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4+8=姓名:时间:成绩:7+7=9+5=7+8=7+5=9+9=5+7=8+4=8+4=9+3=9+6=4+8=8+5=7+8=9+7=3+8=4+8=9+2=3+9=4+7=9+4=7+9=9+2=4+9=4+8=7+9=9+8=6+8=5+7=4+7=9+7=8+3=7+4=5+6=9+9=7+9=3+8=8+5=8+3=9+9=9+9=9+7=3+8=9+2=7+5=4+8=4+7=5+9=4+8=8+6=6+6=5+9=6+8=4+9=9+9=6+5=8+4=9+4=3+9=5+8=作编号:GB8878185555334563BT9125XW作者:凤呜大王*5+9=9+2=7+6=7+5=8+3=9+9=5+7=6+7=6+6=8+4=姓名:时间:成绩:5+8=3+8=6+6=6+6=7+6=2+9=7+6=5+7=6+8=8+8=6+7=6+7=2+9=6+8=8+4=8+4=7+9=2+9=6+9=6+9=7+7=7+8=9+8=8+4=6+5=9+3=9+2=6+7=8+9=9+8=4+8=9+9=7+9=5+7=8+3=9+2=8+6=9+2=7+7=8+7=3+9=7+6=9+6=8+9=5+7=8+9=9+7=8+6=7+5=7+7=2+9=9+7=4+8=8+5=5+8=9+7=6+5=6+9=6+9=8+7=9+6=9+4=6+9=4+7=3+9=5+7=作编号:GB8878185555334563BT9125XW作者:凤呜大王*7+8=7+9=9+2=姓名:时间:成绩:9+5=9+8=2+9=4+7=9+9=4+9=8+8=8+7=8+6=8+7=8+7=9+9=6+6=7+4=9+3=3+9=9+3=9+5=6+8=7+6=6+9=8+3=6+5=8+3=8+4=4+7=7+6=5+8=8+8=7+5=7+9=3+8=8+6=8+5=9+6=6+6=5+9=7+6=7+8=9+8=8+3=7+4=8+4=6+5=8+4=6+5=6+8=4+9=3+8=4+7=8+7=9+9=6+5=7+9=4+8=9+2=5+9=6+6=3+8=9+6=9+8=6+9=3+8=9+7=5+7=9+3=9+6=7+9=9+9=8+5=7+5=9+2=6+6=6+8=7+8=姓名: 时间: 成绩:3+9= 5+6= 9+7= 2+9= 6+7= 7+8= 9+8= 7+9=创作编号:GB8878185555334563BT9125XW创作者: 凤呜大王*9+2= 8+9= 4+7= 5+6= 9+2= 7+4= 7+5= 5+7= 3+8= 7+6= 9+7= 9+2= 5+9= 8+5= 7+7=6+7= 5+6= 3+8= 6+5= 2+9= 5+8= 4+8= 8+3= 2+9= 6+6= 6+9= 6+7= 8+7=6+5= 5+6= 9+8=9+2= 8+8= 2+9= 7+9= 4+7= 9+2= 8+5= 3+8= 8+9= 8+7= 8+5= 7+4= 5+9=8+4= 5+9=6+6= 5+7= 8+9= 4+7= 8+5= 9+2= 8+7= 7+9= 6+8= 4+8= 7+4= 6+6= 3+9= 5+6= 9+7=姓名:时间:成绩:8+4=6+5=6+5=9+5=9+8=8+3=8+3=9+6=7+9=7+5=6+8=7+7=8+4=9+2=3+8=5+8=8+7=6+6=8+9=8+6=7+4=5+9=9+2=9+4=6+6=5+6=6+7=9+3=3+9=5+7=9+2=6+6=3+9=9+3=8+7=创作编号:GB8878185555334563BT9125XW创作者:凤呜大王*7+8=3+8=8+5=8+8=5+8=8+5=5+7=9+9=9+3=8+3=6+9=9+9=5+6=7+5=6+6=3+8=3+8=8+7=6+6=6+7=5+8=8+3=3+8=5+7=7+7=9+5=4+8=9+7=9+4=8+6=4+7=6+8=8+8=9+9=姓名:时间:成绩:9+9=8+5=9+7=6+9=8+6=3+8=8+3=5+7=9+3=4+8=8+6=8+9=8+9=8+3=9+8=8+5=4+8=4+8=7+8=6+7=6+5=9+8=8+4=4+7=8+4=7+7=9+4=3+8=7+8=9+6=6+8=7+8=4+8=8+9=6+5=9+9=4+9=2+9=8+4=9+6=5+8=8+9=7+7=7+5=9+7=4+8=5+8=6+8=7+9=4+9=9+3=2+9=5+6=8+4=9+9=6+7=9+2=5+7=9+7=6+6=8+4=9+6=7+4=6+9=6+9=9+2=3+8=7+5=2+9=8+7=7+8=6+8=作编号:GB887818555姓名: 时间: 成绩:5334563BT9125XW创作者: 凤呜大王*6+9= 7+8= 9+5= 9+4= 5+8= 3+9= 8+4= 8+9= 7+8= 9+8= 8+8= 9+5=7+5= 8+4= 8+4=5+8= 6+5= 8+9= 9+4= 3+9= 8+8= 8+5= 8+5= 4+7= 7+8= 9+9= 7+5=9+2= 8+4= 5+8= 9+2= 8+3= 3+8= 6+7= 4+8= 4+8= 4+8= 9+8= 9+2= 8+6= 3+8= 9+7=6+9= 7+6= 8+9= 5+7= 6+7= 9+2= 3+8= 9+9= 3+9= 6+5= 7+8= 3+8= 7+4= 6+7= 3+9=8+9= 9+7= 4+8= 7+9= 9+5= 9+8= 8+7= 8+9= 7+9= 4+9= 7+6= 9+8= 6+7= 4+9= 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一年级数学20以内的进位加法(共30张)01

一年级数学20以内的进位加法(共30张)01

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+ 8 = 6 + 9 = 9 + 4 = 2 + 8 = 4 + 7 = 4 + 8 = 9 + 9 = 1 + 9 = 5 + 7 = 6 + 9 = 6 + 5 = 1 + 9 = 3 + 9 = 4 + 6 = 4 + 9 = 4 + 8 = 8 + 2 = 9 + 2 = 3 + 7 = 5 + 6 = 9 + 1 = 8 + 3 = 6 + 9 = 8 + 3 = 5 + 6 = 7 + 6 = 7 + 3 = 9 + 9 = 9 + 1 = 6 + 7 =题数:50 共:100分分秒成绩:8 + 4 = 6 + 8 = 5 + 8 = 9 + 3 = 7 + 6 = 8 + 7 = 5 + 7 = 8 + 4 = 7 + 5 = 6 + 6 = 8 + 7 = 9 + 5 = 4 + 7 = 5 + 5 = 5 + 6 = 4 + 9 = 8 + 9 = 6 + 8 = 7 + 6 = 4 + 7 =7 + 9 = 5 + 5 = 4 + 9 = 6 + 5 = 8 + 4 =8 + 9 = 6 + 9 = 8 + 3 = 8 + 2 = 9 + 1 = 7 + 5 = 5 + 5 = 5 + 8 = 3 + 9 = 4 + 8 = 4 + 6 = 8 + 6 = 7 + 4 = 6 + 7 = 5 + 9 =8 + 2 = 3 + 7 = 3 + 9 = 6 + 6 = 5 + 5 =9 + 5 = 9 + 9 = 5 + 5 = 6 + 5 = 8 + 7 =题数:50 共:100分分秒成绩:5 + 8 = 8 + 3 =6 +7 = 1 + 9 = 9 + 6 = 9 +8 = 7 + 6 = 7 + 4 =9 + 3 = 5 + 5 = 4 + 9 = 6 + 8 = 7 + 3 = 8 + 7 = 7 + 8 = 9 + 5 = 8 + 7 = 2 + 9 = 8 + 9 = 7 + 7 = 7 + 8 = 8 + 3 = 8 + 6 = 4 + 9 = 9 + 3 = 7 + 8 = 9 + 3 = 7 + 8 = 9 + 9 = 4 + 8 = 2 + 8 = 7 + 8 = 6 + 7 = 8 + 5 = 6 + 6 = 9 + 4 = 5 + 6 = 4 + 9 = 3 + 9 = 9 + 1 = 6 + 7 = 4 + 6 = 7 + 8 = 6 + 9 = 9 + 8 = 6 + 9 = 1 + 9 = 4 + 8 = 6 + 4 = 5 + 6 =题数:50 共:100分分秒成绩:7 + 3 = 6 + 6 = 5 + 9 = 5 + 6 = 6 + 8 = 9 + 6 = 9 + 2 = 9 + 9 = 7 + 9 = 7 + 7 = 6 + 9 = 8 + 6 = 8 + 5 = 7 + 5 = 5 + 7 = 9 + 6 = 9 + 5 = 9 + 7 = 8 + 8 = 5 + 9 =4 + 8 = 7 + 7 = 8 + 9 = 9 + 4 = 8 +5 =5 + 8 = 7 + 7 = 7 + 5 = 1 + 9 = 7 + 9 =6 + 8 = 6 + 4 = 3 +7 = 5 + 9 = 4 + 9 = 6 + 6 = 4 + 7 = 9 + 9 = 9 + 4 = 9 + 2 = 5 + 7 = 6 + 7 = 9 + 5 = 7 +8 =9 + 6 = 7 + 3 = 9 + 1 = 8 + 6 = 9 + 8 = 4 + 9 =题数:50 共:100分分秒成绩:9 + 2 = 5 + 8 = 6 + 6 = 6 + 5 = 8 + 2 = 8 + 6 = 8 + 8 = 5 + 5 = 9 + 4 = 6 + 8 = 7 + 6 = 8 + 4 = 7 + 9 = 9 + 3 = 5 + 7 = 7 + 8 = 6 + 8 = 7 + 4 = 1 + 9 = 8 + 8 = 3 + 8 = 3 + 7 = 7 + 4 = 5 + 9 = 7 + 4 =7 + 8 = 5 + 7 = 6 + 8 = 5 + 5 = 9 + 3 =8 + 6 = 7 + 7 = 9 + 3 = 5 + 5 = 6 + 5 = 3 + 7 = 7 + 3 = 5 + 8 = 9 + 5 = 7 + 9 = 1 + 9 = 8 + 2 = 9 + 2 = 3 + 7 = 4 + 7 = 8 + 8 = 9 + 7 = 7 + 3 = 7 + 3 = 9 + 7 =题数:50 共:100分分秒成绩:3 + 9 = 9 + 5 = 7 + 9 = 9 +4 = 3 + 7 =4 + 9 = 2 + 9 = 7 +5 = 5 + 9 = 7 + 5 = 9 + 7 = 9 + 1 =6 + 8 = 2 + 8 = 8 + 6 =7 + 9 = 7 + 6 =8 + 5 = 5 + 5 = 2 +9 =6 + 8 = 6 + 4 = 6 + 9 = 9 + 9 =7 + 6 =7 + 3 = 2 + 9 = 6 + 9 = 7 + 3 = 4 + 6 = 9 + 7 = 8 + 6 = 6 + 8 = 7 + 5 = 8 + 3 = 8 + 4 = 6 + 6 = 5 + 6 = 8 + 5 = 7 + 7 = 8 + 5 = 9 + 5 = 9 + 4 = 9 + 9 = 5 + 7 = 6 + 7 = 7 + 8 = 8 + 8 = 9 + 2 = 8 + 4 =题数:50 共:100分分秒成绩:8 + 9 = 4 + 8 = 7 + 3 = 7 + 6 = 8 + 5 = 4 + 7 = 1 + 9 = 9 + 6 = 8 + 3 = 5 + 5 = 3 + 8 = 9 + 7 = 8 + 6 = 5 + 6 = 7 + 9 = 9 + 2 = 9 + 1 = 9 + 8 = 8 + 6 = 8 + 7 = 8 + 8 = 3 + 8 = 8 + 7 = 2 + 9 = 5 + 6 = 2 + 8 = 9 + 9 = 5 + 9 = 7 + 5 = 1 + 9 =7 + 3 = 8 + 8 = 7 + 6 = 9 + 8 = 3 + 9 =8 + 7 = 7 + 8 = 6 + 7 = 8 + 4 = 6 + 6 = 7 + 5 = 8 + 6 = 9 + 1 = 8 + 9 = 6 + 6 = 4 + 6 = 3 + 8 = 6 + 7 = 7 + 8 = 6 + 8 =题数:50 共:100分分秒成绩:7 + 6 = 9 + 1 = 9 + 6 = 5 + 9 = 9 + 2 = 5 + 6 = 9 + 3 = 6 + 4 = 6 + 7 = 5 + 7 = 9 + 6 = 6 + 6 = 6 + 4 = 7 + 3 = 8 + 8 = 2 + 8 = 4 + 7 = 9 + 1 = 8 + 8 = 9 + 2 = 9 + 5 = 7 + 8 = 9 + 7 = 6 + 4 = 7 + 6 = 9 + 7 = 6 + 4 = 8 + 5 = 8 + 8 = 6 + 9 = 9 + 5 = 7 + 7 = 3 + 9 = 4 + 9 = 9 + 5 = 8 + 4 = 6 + 7 = 9 + 7 = 9 + 3 = 5 + 8 = 6 + 7 = 5 + 6 = 8 + 9 = 4 + 6 = 9 + 4 = 1 + 9 = 2 + 9 = 2 + 8 = 8 + 9 = 4 + 6 =题数:50 共:100分分秒成绩:7 + 8 = 6 + 7 = 8 + 8 = 1 + 9 = 9 + 6 = 6 + 9 = 7 + 4 = 8 + 9 = 9 + 7 = 3 + 7 = 4 + 8 = 9 + 4 = 3 + 7 = 2 + 8 = 9 + 3 = 9 + 7 = 9 + 9 = 8 + 2 = 1 + 9 = 7 + 9 = 6 + 6 = 9 + 2 = 5 + 5 = 6 + 8 = 7 + 7 = 6 + 7 = 7 + 8 = 5 + 5 = 9 + 3 = 7 + 5 = 5 + 8 = 9 + 5 = 8 + 2 = 3 + 9 = 8 + 6 = 3 + 8 = 9 + 5 = 7 + 9 = 9 + 7 = 4 + 8 = 7 + 9 = 9 + 6 = 2 + 8 = 3 + 7 = 9 + 7 = 7 + 9 = 7 + 4 = 6 + 6 = 5 + 7 = 7 + 6 =题数:50 共:100分分秒成绩:5 +6 = 9 + 3 = 9 +7 = 6 + 6 = 4 + 9 =8 + 8 = 6 + 7 = 7 + 3 = 5 +9 = 6 + 9 = 8 + 9 = 8 + 6 = 9 + 9 = 7 + 4 = 8 + 7 = 7 + 6 = 9 + 8 = 5 + 9 = 7 + 3 = 3 + 7 = 3 + 9 = 6 + 4 = 3 + 7 = 3 + 8 = 8 + 5 = 3 + 8 = 6 + 8 = 5 + 7 = 4 + 9 = 3 + 9 = 6 + 4 = 8 + 9 = 4 + 8 = 5 + 8 = 8 + 9 = 5 + 7 = 7 + 6 = 8 + 3 = 2 + 9 = 8 + 7 = 4 + 8 = 3 + 7 = 8 + 3 = 8 + 5 = 7 + 7 = 3 + 8 = 5 + 8 = 6 + 5 = 4 + 9 = 7 + 3 =题数:50 共:100分分秒成绩:9 + 7 = 9 + 4 = 6 + 5 = 6 + 8 = 8 + 2 = 7 + 8 = 1 + 9 = 6 + 8 = 7 + 4 = 8 + 7 = 9 + 1 = 9 + 8 = 5 + 5 = 2 + 9 = 5 + 8 = 6 + 4 = 5 + 5 = 4 + 7 = 6 + 8 = 6 + 6 = 8 + 2 = 7 + 4 = 8 + 5 = 9 + 4 = 8 + 9 = 8 + 8 = 5 + 5 = 9 + 6 = 8 + 5 = 9 + 6 = 6 + 9 = 7 + 5 = 4 + 6 = 9 + 7 = 9 + 4 = 6 + 5 = 6 + 8 = 8 + 2 = 7 + 8 = 1 + 9 = 6 + 8 = 7 + 4 = 8 + 7 = 9 + 1 = 9 + 8 = 5 + 5 = 2 + 9 = 5 + 8 = 6 + 4 = 5 + 5 =题数:50 共:100分分秒成绩:9 + 3 = 8 + 6 = 1 + 9 = 5 + 6 = 7 + 5 =8 + 5 = 8 + 9 = 5 + 7 = 6 + 4 = 5 + 9 =9 + 2 = 6 + 4 = 9 + 2 = 7 + 7 = 9 + 1 = 4 + 9 = 5 + 6 = 6 + 7 = 7 + 9 = 3 + 8 = 8 + 3 = 7 + 9 = 8 + 7 = 9 + 1 = 8 + 3 = 5 + 7 = 7 + 4 = 5 + 8 = 3 + 7 = 9 + 5 = 5 + 8 = 3 + 8 = 7 + 6 = 9 + 3 = 8 + 6 = 1 + 9 = 5 + 6 = 7 + 5 = 8 + 5 = 8 + 9 = 5 + 7 = 6 + 4 = 5 + 9 = 9 + 2 = 6 + 4 = 9 + 2 = 7 + 7 = 9 + 1 = 4 + 9 = 5 + 6 =题数:50 共:100分分秒成绩:4 + 9 =5 + 7 = 8 + 2 = 9 + 8 = 9 + 5 =6 + 5 =7 + 4 = 7 +8 =9 + 9 = 8 + 4 = 5 + 9 = 5 + 7 = 8 + 3 = 5 + 5 = 9 + 6 = 3 + 9 = 8 + 2 = 3 + 9 = 9 + 7 = 2 + 9 = 5 + 7 = 6 + 8 = 7 + 7 = 4 + 8 = 9 + 8 = 7 + 8 = 7 + 5 = 2 + 8 = 8 + 7 = 5 + 7 = 3 + 7 = 8 + 3 = 7 + 3 = 4 + 9 = 5 + 7 = 8 + 2 = 9 + 8 = 9 + 5 = 6 + 5 = 7 + 4 =7 + 8 = 9 + 9 = 8 + 4 = 5 + 9 = 5 + 7 =8 + 3 = 5 + 5 = 9 + 6 = 3 + 9 = 8 + 2 =题数:50 共:100分分秒成绩:4 + 7 = 6 + 8 = 6 + 6 = 8 + 2 = 7 + 4 =8 + 5 = 9 + 4 = 8 + 9 = 8 + 8 = 5 + 5 =9 + 6 = 8 + 5 = 9 + 6 = 6 + 9 = 7 + 5 = 9 + 4 = 9 + 8 = 7 + 3 = 7 + 8 = 7 + 6 = 9 + 8 = 5 + 6 = 7 + 6 = 5 + 5 = 6 + 6 = 6 + 9 = 5 + 8 = 8 + 3 = 8 + 7 = 8 + 4 = 9 + 9 = 7 + 6 = 9 + 9 = 5 + 9 = 9 + 9 = 4 + 7 = 6 + 4 = 4 + 8 = 3 + 7 = 6 + 5 = 9 + 2 = 8 + 8 = 9 + 6 = 6 + 4 = 7 + 7 = 8 + 4 = 7 + 8 = 9 + 6 = 3 + 9 = 5 + 5 =题数:50 共:100分分秒成绩:6 +7 = 7 + 9 = 3 +8 = 8 + 3 = 7 +9 = 8 + 7 = 9 + 1 = 8 + 3 = 5 + 7 = 7 + 4 = 5 + 8 = 3 + 7 = 9 + 5 = 5 + 8 = 8 + 3 = 4 + 9 = 5 + 7 = 9 + 6 = 8 + 9 = 8 + 5 = 2 + 8 = 5 + 5 = 6 + 7 = 9 + 8 = 7 + 5 = 4 + 7 = 6 + 9 = 9 + 5 = 3 + 9 = 4 + 7 = 6 + 6 = 6 + 9 = 9 + 3 = 9 + 2 = 8 + 5 = 8 + 2 = 5 + 9 = 5 + 8 = 7 + 8 = 8 + 4 = 6 + 5 = 8 + 5 = 8 + 2 = 2 + 8 = 5 + 6 = 6 + 9 = 1 + 9 = 9 + 3 = 7 + 6 = 8 + 5 =题数:50 共:100分分秒成绩:3 + 9 = 9 + 7 = 2 + 9 = 5 + 7 = 6 + 8 = 7 + 7 =4 + 8 = 9 + 8 = 7 + 8 = 7 +5 = 2 + 8 = 8 + 7 = 5 + 7 = 3 + 7 = 7 + 9 = 9 + 1 = 7 + 8 = 9 + 7 = 3 + 8 = 5 + 8 =6 + 6 = 5 + 8 = 3 + 9 =7 +8 = 4 + 6 =7 + 4 = 6 + 5 = 4 + 6 = 8 + 5 = 7 + 7 = 6 + 8 = 1 + 9 = 8 + 8 = 5 + 8 = 5 + 5 = 6 + 5 = 7 + 9 = 8 + 2 = 8 + 9 = 6 + 4 = 8 + 4 = 9 + 5 = 7 + 7 = 2 + 9 = 3 + 7 = 8 + 7 = 5 + 5 = 9 + 2 = 3 + 8 = 9 + 8 =题数:50 共:100分分秒成绩:7 + 9 = 5 + 9 = 6 + 6 = 7 + 4 = 3 + 7 = 6 + 8 = 4 + 6 = 8 + 7 = 2 + 8 = 5 + 7 = 5 + 9 = 7 + 5 = 9 + 4 = 5 + 6 = 6 + 9 = 9 + 1 = 9 + 5 = 8 + 6 = 5 + 9 = 4 + 8 = 6 + 7 = 7 + 8 = 9 + 3 = 5 + 6 = 6 + 6 = 8 + 2 = 5 + 8 = 5 + 6 = 4 + 9 = 5 + 9 =7 + 5 = 7 + 4 = 4 + 6 = 9 + 2 = 9 + 3 =8 + 3 = 9 + 6 = 2 + 9 = 8 + 2 = 9 + 8 = 7 + 6 = 7 + 7 = 9 + 8 = 4 + 6 = 3 + 8 = 4 + 7 = 9 + 8 = 7 + 3 = 2 + 9 = 5 + 6 =题数:50 共:100分分秒成绩:2 + 9 = 5 + 8 = 8 + 4 = 6 + 9 = 4 + 7 =3 + 7 = 7 + 3 = 5 + 8 = 9 + 6 =4 + 6 = 8 + 8 = 6 + 7 = 1 + 9 = 9 + 7 = 6 +5 = 7 + 8 =6 + 8 =7 + 7 = 6 + 6 = 9 + 3 =7 + 4 = 2 + 8 = 8 + 4 = 9 + 7 = 9 + 4 =8 + 3 = 7 + 3 = 9 + 2 = 4 + 7 = 8 + 6 =9 + 6 = 6 + 5 = 9 + 5 = 6 + 6 = 9 + 5 = 4 + 8 = 9 + 3 = 9 + 6 = 8 + 9 = 3 + 7 = 3 + 8 = 6 + 9 = 9 + 5 = 3 + 7 = 9 + 6 = 9 + 9 = 7 + 6 = 8 + 7 = 3 + 7 = 6 + 6 =题数:50 共:100分分秒成绩:7 + 8 = 6 + 7 = 3 + 9 = 9 + 5 = 7 + 7 = 9 + 7 = 8 + 5 = 6 + 9 = 9 + 9 = 8 + 4 = 9 + 1 = 8 + 3 = 5 + 9 = 2 + 8 = 9 + 6 = 6 + 9 = 6 + 4 = 9 + 2 = 3 + 8 = 9 + 6 = 9 + 9 = 8 + 9 = 9 + 4 = 5 + 7 = 7 + 3 = 6 + 7 = 4 + 7 = 8 + 9 = 1 + 9 = 6 + 4 = 9 + 9 = 2 + 8 = 6 + 4 = 8 + 7 = 3 + 7 = 7 + 9 = 6 + 9 = 6 + 8 = 5 + 5 = 9 + 5 = 9 + 1 = 9 + 6 = 9 + 9 = 9 + 7 = 6 + 9 = 5 + 5 = 5 + 9 = 5 + 6 = 7 + 8 = 8 + 4 =题数:50 共:100分分秒成绩:6 + 4 = 8 + 5 =7 +8 = 5 +9 = 9 + 3 = 5 + 6 = 9 + 2 = 4 + 9 = 7 + 9 = 6 + 4 = 8 + 2 = 8 + 8 = 5 + 5 = 1 + 9 = 7 + 6 = 6 + 4 = 6 + 8 = 9 + 7 = 9 + 5 = 8 + 9 = 8 + 5 = 7 + 8 = 8 + 9 = 8 + 6 = 3 + 7 = 4 + 7 = 6 + 9 = 9 + 3 = 8 + 5 = 3 + 9 = 7 + 3 = 2 + 8 = 6 + 5 = 9 + 9 = 7 + 9 =6 + 6 = 3 + 8 =7 +8 = 8 +9 = 3 + 7 =7 + 5 = 9 + 1 = 4 + 7 = 3 + 8 = 7 + 4 = 3 + 7 = 8 + 5 = 6 + 4 = 5 + 5 = 9 + 1 =题数:50 共:100分分秒成绩:4 + 7 = 9 + 8 =5 + 7 = 5 + 8 = 8 + 7 = 3 + 9 = 9 + 4 = 7 + 8 = 9 + 1 = 9 + 7 = 9 + 4 = 5 + 9 =6 +7 = 9 +8 = 7 + 3 = 4 +9 = 4 + 6 = 7 + 7 = 3 + 9 = 4 + 9 = 7 + 4 = 8 + 3 = 9 + 4 = 5 + 7 = 8 + 9 = 9 + 4 = 3 + 8 = 6 + 7 = 9 + 3 = 6 + 9 = 4 + 8 = 9 + 1 = 8 + 9 = 3 + 7 = 9 + 1 = 9 + 4 = 8 + 2 = 5 + 5 = 2 + 9 = 3 + 8 = 8 + 7 = 9 + 9 = 5 + 9 = 9 + 4 = 9 + 6 = 5 + 9 = 8 + 8 = 6 + 9 = 9 + 6 = 9 + 8 =题数:50 共:100分分秒成绩:7 + 5 = 4 + 7 = 8 + 6 = 8 + 2 = 6 + 9 = 7 + 8 = 6 + 7 = 8 + 7 = 4 + 7 = 3 + 9 =4 + 7 = 1 + 9 = 9 +5 = 5 + 7 =6 +7 =5 +6 = 8 + 4 = 6 + 9 = 1 + 9 = 9 + 5 = 8 + 9 = 9 + 5 = 4 + 8 = 6 + 5 = 9 + 8 = 6 + 8 = 6 + 5 = 1 + 9 = 5 + 5 = 3 + 8 = 8 + 9 = 8 + 2 = 5 + 8 = 8 + 3 = 5 +7 = 6 + 5 = 7 + 5 =8 + 8 =9 + 6 = 9 + 9 = 9 + 8 = 9 + 3 = 8 + 7 = 2 + 8 = 3 + 9 = 3 + 8 = 9 + 6 = 5 + 6 = 3 + 7 = 6 + 7 =题数:50 共:100分分秒成绩:5 + 9 = 8 + 4 = 7 +6 =7 + 7 = 2 + 9 = 1 + 9 = 9 + 4 = 9 + 5 = 7 +8 = 6 + 6 =8 + 9 = 8 + 6 = 9 + 7 = 7 + 4 = 9 + 5 =9 + 2 = 7 + 6 = 9 + 2 = 4 + 6 = 8 + 7 = 9 + 5 = 8 + 7 = 8 + 4 = 9 + 7 = 8 + 6 = 2 + 9 = 4 + 9 = 8 + 9 = 4 + 7 = 4 + 6 =6 + 6 = 5 + 8 = 5 +7 = 9 + 2 = 3 +8 =7 + 4 = 8 + 8 = 9 + 9 = 6 + 6 = 6 + 8 = 1 + 9 = 7 + 6 = 6 + 8 = 5 + 9 = 4 + 9 = 9 + 5 = 4 + 9 = 7 + 9 = 1 + 9 = 9 + 3 =题数:50 共:100分分秒成绩:4 + 9 =5 + 8 = 4 + 8 = 8 + 8 =6 + 5 = 9 +7 = 9 + 1 =8 + 8 = 8 + 2 = 5 + 8 = 4 + 6 = 5 + 7 = 2 + 8 = 8 +9 = 9 + 3 =7 + 5 = 3 + 9 = 9 + 1 = 8 + 5 = 8 + 9 =8 + 3 = 7 + 9 = 9 + 4 = 8 + 4 = 5 + 9 = 8 + 7 = 2 + 8 = 5 + 8 = 3 + 8 = 9 + 5 = 6 + 9 = 5 + 9 = 6 + 5 = 9 + 9 = 7 + 7 = 8 + 2 = 7 + 3 = 8 + 3 = 4 + 8 = 8 + 5 = 2 + 9 = 9 + 8 = 7 + 5 = 9 + 6 = 8 + 6 = 5 + 5 = 1 + 9 = 7 + 8 = 6 + 5 = 7 + 6 =题数:50 共:100分分秒成绩:8 + 6 = 9 + 5 = 7 + 3 = 7 + 8 = 9 + 9 = 7 + 9 = 4 + 8 = 6 + 5 = 7 + 9 = 9 + 2 =7 + 5 = 9 + 2 = 3 + 8 = 9 + 4 = 1 + 9 =8 + 5 = 4 + 9 = 7 + 3 = 9 + 5 = 6 + 8 = 5 + 7 = 1 + 9 = 8 + 7 = 9 + 5 = 4 + 7 = 5 + 5 = 4 + 6 = 8 + 4 = 7 + 7 = 6 + 8 = 3 + 7 = 6 + 8 = 9 + 4 = 8 + 5 = 4 + 9 =5 +6 = 3 + 9 =7 + 6 = 6 + 5 = 9 + 1 =6 + 5 =7 +8 =9 + 5 = 7 + 8 = 8 + 7 = 9 + 8 = 7 + 7 = 7 + 5 = 7 + 3 = 5 + 7 =题数:50 共:100分分秒成绩:6 + 5 =7 + 3 = 7 + 9 = 7 + 7 = 6 + 5 =8 + 4 = 8 + 8 = 7 + 8 =9 + 6 = 5 + 9 = 8 + 2 = 7 + 7 = 8 + 9 = 7 + 9 = 8 + 7 = 8 + 2 = 7 + 6 = 6 + 7 = 5 + 8 = 2 + 8 = 2 + 9 = 7 + 3 = 6 + 8 = 9 + 5 = 6 + 6 = 2 + 8 = 9 + 5 = 7 + 9 = 9 + 9 = 5 + 8 = 8 + 5 = 6 + 8 = 9 + 6 = 5 + 7 = 8 + 5 = 8 + 6 = 7 + 7 = 5 + 6 = 2 + 9 = 4 + 8 = 5 + 8 = 9 + 7 = 8 + 5 = 4 + 9 = 5 + 7 = 5 + 9 = 6 + 6 = 9 + 6 = 6 + 7 = 4 + 6 =题数:50 共:100分分秒成绩:4 + 9 = 8 +5 =6 +7 = 9 + 7 =8 + 5 = 8 +9 = 9 + 8 = 4 + 8 = 6 + 4 = 8 + 3 = 5 + 9 = 6 + 4 = 6 + 5 = 9 + 8 = 9 + 3 = 9 + 4 = 8 + 2 = 8 + 6 = 4 + 9 = 3 + 9 = 6 + 5 = 9 + 5 = 7 + 3 = 9 + 7 = 7 + 5 = 8 + 8 = 8 + 5 = 4 + 7 = 9 + 4 = 9 + 2 = 5 + 6 = 5 + 8 = 6 + 7 = 9 + 9 = 8 + 8 = 9 + 4 = 4 + 8 = 1 + 9 = 5 + 9 = 3 + 8 = 8 + 7 = 5 + 5 = 9 + 6 = 8 + 3 = 7 + 7 = 8 + 8 = 2 + 8 = 5 + 7 = 9 + 9 = 6 + 9 =题数:50 共:100分分秒成绩:7 + 4 = 9 + 5 = 5 + 6 = 4 + 8 = 3 + 8 =7 + 4 = 9 + 7 = 4 + 7 = 4 + 6 = 1 + 9 =8 + 3 = 7 + 5 = 7 + 6 = 9 + 1 = 4 + 6 = 1 + 9 = 4 + 8 = 5 + 5 = 9 + 6 = 6 + 8 = 8 + 9 = 8 + 3 = 4 + 7 = 8 + 9 = 8 + 3 = 6 + 7 = 5 + 6 = 3 + 9 = 3 + 9 = 9 + 7 = 3 + 9 = 6 + 6 = 4 + 6 = 6 + 9 = 4 + 9 = 1 + 9 = 8 + 4 = 6 + 4 = 8 + 6 = 5 + 9 = 7 + 8 = 6 + 6 = 3 + 7 = 7 + 4 = 9 + 6 = 9 + 4 = 9 + 5 = 8 + 5 = 8 + 8 = 4 + 9 =。

《5、4、3、2加几》20以内的进位加法PPT教学课件

《5、4、3、2加几》20以内的进位加法PPT教学课件
5+ 8 = 13 9 = 14
7 = 11 8 = 11
4+ 8 = 12 3+ 9 = 12 9 = 13
可以拆分其中的一个加数,把另一个加数凑十。
选自教材第95页做一做第3题
1.在(
变式训练
)里填上合适的数。
8+( 7 )=15 2+( 9 )=11 3+( 8 )=11 ( 9 )+3=12
4、3、2加几的进位加 法算式有哪些?
4 + 9 = 13 4 + 8 = 12 4 + 7 = 11
3 + 9 = 12 3 + 8 = 11
2 + 9 = 11
也可以利用交换加数的位 置,和不变的规律计算。
5+8= 13 4+8= 12 3+9= 12
8+5= 13 8+4= 12 9+3= 12
人教版·数学·一年级·上册
第八单元 20以内的进位加法
5、4、3、2加几
第1课时
复习导入 口算。 7+5=12
8+5=13
9+5=14 6+5=11
6+7=13
6+8=14 7+9=16
探究新知 4
5+7= 4+8=
5+8= 3+9=
怎样想能快速 地说出得数?
5+7= 12 8、9、10、11、12。
4
5+7= 12 4+8= 12
5+8= 13 3+9= 12
怎样想能快 速说出得数?
通过已有知识的迁移,寻找 5、4、3、2加几计算方法这一 过程,明白了加法计算方法。
算一算
4 + 8= 12 62
10
3 + 8= 11
71 10
2 + 9= 11
81 10
算一算
4 + 8= 12
22 10
看谁算得快。
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学生看书上的蚂蚁图并指名说说是什么意思?师:能用算式表 Nhomakorabea出来吗?
指名板书,其他同学写在书上。
学生独立完成书上的糖果图,再集体订正。
蜜蜂图(书上100页第5题)
师:瞧这群小蜜蜂在干吗?(指名说)
能用算式表示出来吗?
指名板书,其他同学写在书上。指名说说是怎样算的?
三、用数学(书上100页第4题)
师:洋娃娃可爱吗?谁来说说这幅图的意思?
课题
9加几的练习课
课时安排
1课时
授课班级
一年级
主备人
潘教贵
辅备人
教学目标
通过练习使学生进一步掌握9加几的口算方法,培养学生口头表达能力和初步的逻辑思维能力。
教学重点
培养学生口头表达能力和初步的逻辑思维能力。
教学难点
培养学生口头表达能力和初步的逻辑思维能力。
教学准备
畅言教学系统
第2课时
教学过程
一、学生操作
学生用自己喜爱的学具摆一摆“9加几”并与同桌说一说。
师:谁来说说“9加几”的加法怎样算。
二、创设情境
小羊图(书上99页第1题)
师:天气晴朗了,小羊羔也出来玩了,你能算出一共有多少只小羊羔吗?
(学生列式计算,指名说说)
教师板书:9+7=16
师:谁来说说是怎样算的?
蚂蚁图(书上99页第3题)
师:同学们知道蚂蚁是怎样运食物的吗?(指名说)
要求一共有多少个怎样算?
指名板书,其他同学写在书上。
师:(边演示边问)如果改变问号的位置你会算吗?
学生试做,然后集体订正。
四、针对学生练习情况进行小结。
五、课堂练习:练习十七第2、6、7题。
板书设计
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