练习十五

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苏教版数学五年级上册《练习十五》优质课件

苏教版数学五年级上册《练习十五》优质课件
答:六年级会游泳的人数最多,一年级会游泳的人数最少。
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练习十五
(2)如果三年级每个班都有45人,三年级学生中有多少人 不会游泳? 45×3-68=67(人) 答:三年级学生中有67人不会游泳。
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练习十五
(3)如果每个班级的学生人数都不超过45人,这个学校最多 有多少人不会游泳? 45×3×6-512=298(人) 答:这个学校最多有298人不会游泳。
0.76×4.9+4.9×0.24
=(1+0.01)×35
=(0.76+0.24)×4.9
=1×35+0.01×35
=1×4.9
=35+0.35
= 4.9
=35.35
2.4×0.25 =0.6×(4×0.25)
=0.6×1
=0.6
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练习十五
4.小力通过查阅资料,将中国与世界部分动物类群中物种数目 制成了下面的统计表。
中国与世界部分动物类群中物种数目统计表
2022年12月
项目中国 世界哺乳类 Nhomakorabea鸟类 爬行类
580 1458 410 4800 12629 6300
两栖类 鱼类
320 4000 4000 31000
(1)上表哪一个动物类群中物种数目最多?
鱼类
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练习十五
中国与世界部分动物类群中物种数目统计表
2022年12月
5. 你了解自己班男、女生的身高情况吗?调查并记录全班同 学的身高(取整厘米数),再完成下面的统计表。
根据调查数据填表并回答问题。
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练习十五
根据表中的数据, 回答下面的问题。 (1)男生身高在哪个范围的人数最多?女生呢? (2)全班同学中,身高在哪个范围的人数最多? 你的身高在

新人教版三年级数学上册课本练习十五详细答案课件PPT

新人教版三年级数学上册课本练习十五详细答案课件PPT
(2)买8个篮球,500元够吗? 58×8 ≈ 480(元) 480 < 500, 500元够。 答: 500元够。
6.
34元 46元 58元
(3)买5个排球,付了200元,应找回多少钱? 34×5 = 170(元) 200 - 170 = 30(元) 答:应找回30元钱。
先算买5个排球花的钱数,再求应找回的钱数。
890×7 = 6230
890 × 67 62 3 0
665×9 ≈ 6300
700
665×9 = 5985
665 × 9 5 4 5985
11.把电焊车间的工人师傅分成6组,每组6人。 如果每组9人,可以分成几组?
6×6÷9 = 36÷9 = 4(组) 答:可以分成4组。
先算出工人总数,再求出可以分成的组数。
先把每袋稻谷的质量 看作60 kg再计算。
59+63+62+60+57+58+62+58 ≈ 60×8 = 480(kg) 答:张大爷家的稻谷大约有480 kg 。
4.一篇文章500字,丁叔叔平均每分钟录入78个 字,6分钟能录完吗?
78×6 ≈ 480(个) 480 < 500, 6分钟不能录入完。 答:6分钟不能录入完。
7.买2个文具盒要用18元。照这样的价格,填写
下表。
18÷2=9(元)
个数 5 6 8 11 13
总价/元 45 54 72 99 117
5×9 = 45(元) 54÷9 = 6(个)72÷9 = 8(个) 11×9 = 99(元) 13×9 = 117(元)
8.8箱蜜蜂可以酿48千克蜂 蜜。24箱蜜蜂可以酿多少 千克蜂蜜?
先算出每千克黄豆可以做出多少豆腐。

2024(新插图)人教版三年级数学上册练习十五-课件

2024(新插图)人教版三年级数学上册练习十五-课件
6×6÷9 =36÷9 =4(组)
答:可以分成4组。
12.小丽用小棒摆了8个三角形。如果用这些小棒摆正方 形,可以摆多少个?(图形的边不能重合。)
摆一个三角形用3根小棒,摆一个正方形用4根小棒。 先求小棒的总根数: 3×8=24(根) 再求可以摆多少个正方形:24÷4=6(个) 答:可以摆6个。
天每
60
480<500,58×8<500 答:500元够。
(3)买5个排球,付了200元,应找回多少钱?
34×5=170(元) 200-170=30(元) 答:应找回30元。
7.买2个文具盒要用18元。照这样的价格,填写下表。
个数
5
6
8
11
12
总价/元 45
54
72
99 108
先算一个文具盒的价格:18÷2=9(元)
8.8箱蜜蜂可以酿48千克蜂蜜。照这样计算,24箱蜜蜂 可以酿多少千克蜂蜜?
48÷8×24 =6×24 =144(千克) 答:24箱蜜蜂可以酿144千克蜂蜜。
9.豆腐坊用5千克黄豆做出20千克豆腐。照这样计算, 用75千克黄豆可以做出多少千克豆腐?
20÷5×75 =4×75 =300(千克) 答:用75千克黄豆可以做出300千克豆腐。
78×6 ≈480(个)
80
480<500,78×6<500 答:6分钟不能录入完。
5.在 中填上“>”“<”或“=”。
23×3 > 60 489×5 < 2600
44×2 > 80 951×6 > 5300
82×9 > 700 65×8 < 550
6. (1)买4个足球,需要多少钱?
46×4=184(元) 答:需要184元。 (2)买8个篮球,500元够吗? 58×8 ≈480(元)

小学六年级数学下册教学课件《练习十五》

小学六年级数学下册教学课件《练习十五》

【教材P79 练习十五 第8题】
8. 六年级办公室买进一包白纸,计划每 天用25张,可以用20天。由于注意了节 约 用 纸 , 实 际 每 天 只 用 了 20 张 , 实 际 比 计划多用多少天?
解:设实际可用x天。 20x=25×20 x=25 25-20=5(天)
答:实际比计划多用5天。
【教材P79 练习十五 第9题】
12.7-3.6-5.4 =12.7-(3.6+5.4)
=12.7-9
=5900+59
=3.7
=5959
24
1 4
5 6
ห้องสมุดไป่ตู้7 8
=24 1 24 5 24 7
4
6
8
=6+20-21
=5
2.5 5 7 84
=587 254
=7
8 9
3 4
7 16
1 4
=
8 9
3 4
1 4
7 16
987×9-3= 8880 9876543×9-7= 88888880
9876×9-4= 88880 98765432×9-8= 888888880
【教材P78 练习十五 第7题】
7. 已知 x 11 y 9 z 7 ,那么x、y、
12
10
8
z的关系是( x )<( y )<( z )。
4.3×790=3397
33.97÷0.79= 43
339.7÷43=7.9
33970÷79= 430
3397÷7.9=430
3. 估算。【教材P78 练习十五 第3题】
803-207≈ 600
798+205≈ 1000
23×498≈ 10000 632÷69≈ 9

人教版六年级上册数学练习十五PPT课件

人教版六年级上册数学练习十五PPT课件
3.14×[(18÷2)2-(7÷2)2] =3.14×(81-12.25) =3.14×68.75 =215.875(cm2) 答:这块玉璧的面积是215.875平方厘米。
易错点:给出的是外圆和内圆的直径,计算面积时要注意使用的是半径。
6.下图中的大圆半径等于小圆的直径,请 你求出涂色部分的面积。[教科书P70 练习十五 第6题]
S=S环1-S环2 =3.14×[(34÷2)2-(14÷2)2] -3.14×[(26÷2)2-(14÷2)2] =3.14×(172-72 -132+72 ) =3.14×120 =376.8(m2)答:两座土楼的房屋占地面积相差376.8 m2
13.一个圆的周长是62.8m,半径增加2 米后,面积增加多少? [教材P71 练习十五 第13题]
= 4 + 31.4
= 35.( 4 cm)
S环=π×(R2-r2) =3.14×(12×12-8×8)
=251.2(cm2)
8.在生活里找找圆环形的物体,测量所 需数据,计算出它的面积。[教科书P70 练习十五 第8题]
9.下图中的铜钱直径为28mm,中间的正 方形边长为6mm。这个铜钱的面积是多少?
r
=
62.8 2× 3.14
=10(m)
R=10+2=12(m)
S增加=3.14×(122-102)
=3.14×44
=138.16(m2) 答:面积增加了138.16m2。
易错点:增加后的面积实际上是一个圆环的面积,而不是 半径为2m的圆的面积。
14.如右图,公园有两块半圆形的草坪,它们的周长 都是128.5 m,这两块草坪的总面积是多少?
树干的横截面近似于圆,它的面积大约是多少?

2024年新人教版二年级数学上册《教材课本练习15练习十五》教学课件

2024年新人教版二年级数学上册《教材课本练习15练习十五》教学课件
想一想:7只小猫钓的鱼,比40条多还是少?
6×6+6=42(条) 42>40
答:比40条多。
6×5= 30 4×4= 16 3×5= 15 4×3= 12 5×6= 30
2. 6×3-8= 10 5×4+30=50 4×4+12= 28
5×3+9=24 6×6+6= 42
4×6-4= 20
3. 1辆小汽车有4个车轮,5辆小汽车有多少个车轮?
4×5=20(个) 或 5×4=20(个) 答:5辆小汽车有20个车轮。
义务教育(2024年)人教版 二年级数学上册
教材课后练习答案 (PPT讲解版) 教学课件
义务教育人教版二年级上册
4 表内乘法(一)
练习十五
1.看谁算得又对又快。
3×6=18 2×6=12
5×3=15 3×3=9
3×1=3
4×5=20
6×4=24 3×4=12
Hale Waihona Puke 4×2=81×6=6
5×5=25 2×3= 6 5×2=10 4×1= 4 6×6= 36
4.超市里的7号电池有一板装4节的,也有一板装6节的。
(1)两种包装的电池各买一板,一共是多少节电池? 4+6=10(节)
答:一共是10节电池。 (2)如果买4板6节装的,一共是多少节电池?
6×4=24(节) 或 4×6=24(节) 答:一共是24节电池。
5.每只小猫钓6条鱼,4只小猫钓多少条鱼? 6 × 4 = 24 ( 条) 或 4×6=24(条) 答:4只小猫钓24条鱼。

人教版五年级上册数学(新插图) 练习十五 教学课件

人教版五年级上册数学(新插图) 练习十五 教学课件
x=4.2
x-45=128 解: x-45+45=128+45
x=173
9x=18 解:9x÷9=18÷9
x=2
x÷4=75 解:x÷4×4=75×4
x=300
[教材P70 练习十五 第4题 ]
4.用方程表示下面的数量关系,并求出方程的解。
(1)x加上35等于91
(2)x的3倍等于57。
x+35=91 解:x+35-35=91-35
7x÷7=6.3 ÷7 x=0.9
x ÷4.5=1.2
解: x ÷4.5×4.5=1.2×4.5 x=1.2×4.5 x=5.4
8.看图列方程,并求出方程的解。[教材P71 练习十五 第8题 ] (1)
x+50=200 解:x+50-50=200-50
x=150
(2)
30+30+x+x=158 解:60+2x=158
11 1111 11 5 5
答案不唯一
7. 从下面的盒子里摸出一个球,在哪个盒子里 更容易摸到 ? 【教材P48 练习十一 第7题】
8.从下面9张卡片中抽出一张,最有可能抽到什么?
【教材P48 练习十一 第8题】
答:讲故事卡片。
9. 只有一枚硬币,猜—猜可能在哪个盒子里。
【教材P48 练习十一 第9题】
猜对的人多,还 是猜错的人多?
5x÷5=95÷5 x=19
18+5x=21
解:18+5x-18=21-18 5x=3
5x÷5=3÷5 x=0.6
8x-4×14=0
7x÷3=8.19
解:8x-4×14+4×14 =0+4×14 解:7x÷3×3=8.19×3

人教版五年级数学上册练习十五详细答案_2022年学习资料

人教版五年级数学上册练习十五详细答案_2022年学习资料

人教版五年级数学上册练习-十五详细答案课件-2020/10.4课本70页练习十五-1.后面括号中哪个x的值是方程的解?-1x+32=76-x44,x=108 212-x=4-x=16,x8-34x=6-x1.5,x=2-43÷x=1.5-x=0.5,x)-2020/104课本70页练习十五-别忘了检验!-2.解下列方程。

-x+0.3=1.8-解:x+0.3-0.3 1.8-0.3-x=1.8-0.3-x=1.5-检验:方程左边=x+0.3-=1.5+0.3-方程右边-所以,x=1.5是方程的解。

-2020/1043+x=5.4-解:3+x-3=5.4-3-x=5.4-3-x=2.4-检验:方程左边=3+x =3+2.4-=方程右边-所以,X=2.4是方程的解。

-2020/10,4x-1.5=4-解:x-1.5+1.5=4+1.5-x=4+1.5-x=5.5-检验:方程左边x-1.5-=5.5-1.5-=方程右边-所以,x=5.5是方程的解。

-2020/10,4-6-=13.6-6-三方程右边-所以,x=13.6是方程的解。

-2020/10,40.3-=方程右边-所以,X=0.3是方程的解。

-2020/10,40.2x=6-解:0.2x÷0.2=6÷0.2-x=6÷0.2-x=30-X=30-检验:方程边=0.2x-=0.2×30-=方程右边-所以,x=30是方程的解。

-2020/10,4x÷1.1=3-解:x÷1.1×1.1=3×1.1-x=3X1.1-X=3.3-x=3.3-检:方程左边=x÷1.1-=3.3÷1.1-=方程右边-所以,X=3.3是方程的解。

-2020/ 0,4x÷5=15-解:x÷5×5=15X5-x=15X5-x=75-检验:方程左边=x÷5-=75 5-三方程右边-所以,七=75是方程的解。

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练习十五I. 错题再现和高频考点(7:20--7:25)141.-Jack _______ like the same person. -Having seen so much in the war_______him more gentle. A.doesn’t seem, has made B.didn’t seen, was makingC.hasn’t seemed, made D.isn’t seeming, made142.Ali’s father talked to him till he was blue in the face, __ it did no good; the boy quitted school anyway. A.because B.since C.but D.therefore143.-Dad, would you buy me an MP3 player if I do well in the first city-wide examination ?--- I _____ . A.would B.shall C.will D.do144.I thought that these computers cost $850, but the price _______up $50.A.went B.will go C.goes D.has gone145.When you rewrite the paragraph, I advise you to _______ the last sentence as it is rather misleading. A.point out B.make out C.leave out D.put out146.My friend Paul was cheated when he paid $1000 for that second-hand car; it was not worth _______ A.that all much B.all that much C.that much all D.much all that147.Alan, _______home very late form his job, found an angry wife waiting for him at breakfast. A.returning B.returned C.to return D.had returned148.They are teachers and don’t realize _______to start and run a company.A.what it takes B.what takes it C.what they take D.what takes them149._______can help but be attracted by the science stories.A.Every body B.Any body C.Somebody D.Nobody150.In order to encourage the students to study hard, the school decides to give the scholarship to ___wins the first in the exam.A.who B.whom C.whomever D.whoeverII. 完形阅读天天练(课堂25分钟)Since I have come to anything doubtfully like spiritual maturity (成熟) I have believed we get out of this world what we put into it. 36 , the rewards are indirect and sometimes hard to 37 , but every once in a while what you 38 comes back to you there and then!A couple of days back my step-son, Josh, was preparing for a big 39 . Children from his primary school were going for their first 40 day at the secondary school, so they would know what to 41 when they started after the summer holidays.I was in the 42 of something when I noticed him 43 in a pot where we keep pens and pencils. Indeed Josh was looking for a pen. He came out with an old ballpoint that was missing a piece off the end. His big day 44 better than that. 45 , I stopped what I was doing and went to the drawer where my favorite pen lived. I would 46 that pen, but this was a special 47 .“Josh,”I said in a deep, 48 voice. “I pass on my very best, favorite pen to you, the next 49 . Guard it well and use it 50 ...”He smiled and said thanks. And I went back to work.Coincidentally, that day was also my 51 , but we were just back from a weekend away and I wasn’t expecting any more 52 . Josh walked up with a big smile on his face and gave me a prettily wrapped box. 53 , I opened it. Inside the box lay a beautiful, brand-new pen!Almost like someone had 54 it! It is so 55 . Give and you SHALL receive!36. A. Luckily B. Eventually C. Usually D. Slowly37. A. choose B. recognize C. afford D. separate38. A. desire B. recommend C. handle D. give39. A. party B. incident C. event D. meeting40. A. trial B. exam C. test D. graduation41. A. expect B. receive C. provide D. convey42. A. case B. progress C. face D. middle43. A. studying B. filling C. searching D. hiding44. A. deserved B. remained C. looked D. changed45. A. However B. So C. Anyway D. Unwillingly46. A. forget B. repair C. miss D. fetch47. A. ceremony B. dream C. promise D. occasion48. A. loud B. serious C. weak D. exciting49. A. generation B. chance C. stage D. period50. A. simply B. faithfully C. clearly D. differently51. A. holiday B. arrival C. performance D. birthday52. A. duties B. gifts C. comments D. smiles53. A. Frightened B. Disappointed C. Worried D. Surprised54. A. planned B. stored C. supplied D. found55. A. challenging B. strange C. casual D. trueABea, a five-year-old girl, was born with a severe illness which means she has to be kept away from other children her age, because her body is so weak that she would be unable to fight off a common cold. Bea was diagnosed with this disease when she was five months old. Since then, the hospital has become her second home, medicines for food, and all kinds of treatments her friends. Bea received a very special treatment when she was four years old, which would allow her to be like a normal child if successful. After that, she spent two weeks in ICU before living for four months on a separate ward(病房). Bea was allowed home in February but still needed a special tube in her nose to send in medicine every two days.Her parents clean the house from top to bottom every two days and hoover (用吸尘器清扫) each morning to make sure Bea is free from any possible bacteria. Anna, Bea’s mother, said, “She is weak but so strong. We’ve never seen any child stronger than her. It seems as if nothing in the world could beat her. We really hope to send her to school next year.”She used to drive on the local playground, but Bea was only allowed to watch sitting in the car. “It was heartbreaking to see Bea staring at the running and laughing children there. She never stopped fighting the disease. I know she’s dying for such a normal life.”Hearing of Bea’s story, the Make-A-Wish Foundation has paid for a play park to be built in her back garden. “Bea is very brave and she has encouraged many children like her,”said the chairman of the foundation.56. If Bea stayed with other children freely, ___________.A. other children would have a higher chance to catch her diseaseB. she would catch a common cold which would kill her quicklyC. her life would be in great danger as she could fall ill easilyD. she would be lost in playing and forget to receive treatment57. From the passage we can infer that ___________.A. Bea will need a tube in her nose all the timeB. Bea has to stay in hospital until she is an adultC. Bea’s parents will send her to school next yearD. Bea’s mother feels proud when talking about her58. The Make-A-Wish Foundation had a play park built for Bea to ___________.A. honor her bravery in fighting against her diseaseB. call for attention to this immune system deficiencyC. encourage more children like Bea to be optimisticD. launch a campaign against this serious disease59. What makes Bea so brave to fight against this serious disease?A. Her parents’encouragement and care.B. Her dreaming of owning a play park.C. Her wish to become a normal child.D. Her doctor’s skills and experience.BA display of supernatural existence or is it an alien interference? Questions still remain unanswered while experts are still researching on the real reason behind stones of Death Valley that slide by themselves, without the interference of humans or animals. In the southwest of the USA lies this mysterious valley—popular as the hottest and driest location in North America and it consists of a dry lakebed named “Racetrack Playa”.“Sailing Stones”of Death Valley are all over the Racetrack Playa. The playa, a flat bed of mud, witnesses the sailing of such stones on its broken surface. The tracks formed by these sailing stones are usually 2. 5 cm deep and 4—12 inches wide, and last usually for three to four years.This phenomenon is a mystery and the exact reason is still under research. Some researchers believe a combination of natural events cause these stones to “sail”. This area of Death V alley can get very cold in the winter nights, causing a layer of ice to form on the baked smooth soil. The rocks are gently pushed across the surface by the ice-coated ground and strong winds.Some researchers question this theory. Some point the conditions have to be just right for these stones to move, perhaps occurring once every one to three years. They say there are some other unknown factors. To add more to this strange phenomenon, these sailing stones don’t follow a specific path that could be predicted when ice and wind are present. Some stones that are physically near each other may start out sailing in a parallel direction, but then one would stop while the other one continues.Other researchers believing that the movements of stones are due to Milky Way. The position of stars create a magnetic structure in a way which makes the stones slide in the valley, just like the tides in oceans which are sometimes caused by the gravitation (万有引力) pull of the moon.So far these mysterious stones and their movements remain unfilmed and unobserved by human eyes.60. The first sentence of the passage is to ___________.A. get readers interested in the subjectB. show how confused researchers gotC. indicate the author’s strong curiosityD. tell the results of researchers’studies61. How many opinions about the reason behind “Sailing Stones”of Death Valley are mentioned?A. 2.B. 3.C. 4.D. 5.62. Which of the following statements is NOT true?A. The mystery of sailing stones hasn’t been solved yet.B. So far the path of the sailing stones can be predicted.C. Death Valley is the hottest and driest place in North America.D. The tracks formed by the sailing stones usually last 3 to 4 years.63. What can be the best title for the passage?A. Death ValleyB. An Alien InterventionC. A Puzzling PhenomenonD. Sailing Stones of Death ValleyIII. 卷二强化练(17:50--18:10)请你就“中国式过马路”Chinese style of crossing road发表自己的观点,并提出解决方案(至少两点)☆备考素材16. 答题技巧和心理1)建议考生原则上按试卷顺序答题,如确实速度较慢,最后可调整作文和改错的顺序。

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