2、口算乘法 估算

按时交货—

两、三位数除以一位数的口算、估算

1、掌握整十数、几百几十数除以一位数

的口算和估算方法。

2、正确、熟练地进行口算和估算。

3、能用学到的知识解决生活中的实际问题。

4、培养学生提出问题，解决问题的能力。

掌握整十数、几百几十数除以一位数的口算和估算方法。

1、掌握整十数、几百几十数除以一位数的口算和估算方法。

2、能用学到的知识解决生活中的实际问题。

教师 多媒体课件

学生 学具袋中的相关学具。

1课时

教学设计 学生学习活动设计

一、创设情境，导入新课

同学们，你们喜欢放风筝吗？你知道有关风筝的哪些情况？

风筝到底是怎样做出来的呢？这节课我们到风筝厂去看看好吗？（出示风筝厂情境图）

二、师生合作，探究新知。

（一）提出问题

这是风筝厂的一个加工车间，请大家认真观察，看你能根据图中的信息提出哪些数学问题？

把你的发现和问题在小组里交流一下。

（二）解决问题

1、我们先来解决“平均每天要做多少只老鹰风筝？”好吗？

谁会列算式？

究竟每天做多少只鹰风筝？你是怎么知道的？

把你的想法在小组里交流一下。

师评价：你真了不起，方法

一、入情入境，学习新知

学生交流。可能会说：

我喜欢放风筝；我有一只老鹰风筝;放风筝必须要有线轴

……

二、师生合作，探究新知。

（一）提出问题

学生观察，独立思考。

小组交流后班级交流：

学生可能提出的问题：

平均每天要做多少只老鹰风筝？

平均每天要做多少只燕子风筝？

平均每天大约要做多少只鹤风筝？

每天大约要做多少只孔雀风筝才能按时交货？

（二）解决问题

1、60÷2

学生独立研究（想或用学具操作）

小组学习后汇报。可能出现的情况：

用学具操作：把6个10平均分成2份，每份是3个10，就是真多。同学们可以选择自己喜欢的方法进行口算。

2、平均每天要做多少只燕子风筝？用你喜欢的方法算一算。

集体交流。

3、小结：

观察今天学习的除法计算和前面学习的有什么不同？

2---5乘法口诀综合练习（一）

5×2= 4×3= 5×6= 4×9=

8×5= 2×6= 4×7= 9×2=

9×5= 4×2= 3×6= 2×5=

5×4= 2×7= 2×8= 3×3=

1×5= 2×5= 3×5= 7×4=

5×3= 9×4= 3×4= 5×9=

2×9= 4×5= 5×3= 4×6=

3×5= 6×4= 8×3= 5×2=

8×2= 3×3= 4×2= 2×3=

4×4= 7×2= 2×2= 5×4=

2---5乘法口诀综合练习（二）

5×3= 3×7= 2×3= 6×4= 2×5= 5×4= 2×7= 2×8= 3×3=

83 ╳ 65 =11 ╳ 76 =86 ╳ 70 =11 ╳ 68 =29 ╳ 77 =24 ╳ 97 =83 ╳ 50 =61 ╳ 93 =82 ╳ 46 =32 ╳ 10 =20 ╳ 51 =5 ╳ 36 =67 ╳ 48 =92 ╳ 10 =38 ╳ 27 =20 ╳ 47 =67 ╳ 35 =73 ╳ 68 =30 ╳ 58 =31 ╳ 9 =61 ╳ 16 =80 ╳ 54 =73 ╳ 14 =76 ╳ 28 =36 ╳ 62 =60 ╳ 73 =28 ╳ 99 =34 ╳ 24 =52 ╳ 63 =39 ╳ 70 =77 ╳ 39 =73 ╳ 7 =54 ╳ 63 =12 ╳ 70 =89 ╳ 27 =72 ╳ 40 =73 ╳ 83 =48 ╳ 65 =40 ╳ 11 =35 ╳ 12 =59 ╳ 46 =3 ╳ 21 =75 ╳ 4 =44 ╳ 72 =79 ╳ 90 =45 ╳ 26 =98 ╳ 64 =92 ╳ 18 =35 ╳ 50 =16 ╳ 77 =48 ╳ 18 =29 ╳ 94 =18 ╳ 26 =26 ╳ 65 =60 ╳ 4 =51 ╳ 98 =45 ╳ 52 =27 ╳ 27 =13 ╳ 20 =25 ╳ 43 =12 ╳ 78 =24 ╳ 79 =67 ╳ 91 =86 ╳ 15 =81 ╳ 88 =31 ╳ 20 =20 ╳ 38 =13 ╳ 88 =24 ╳ 62 =60 ╳ 44 =48 ╳ 71 =31 ╳ 41 =36 ╳ 7 =49 ╳ 47 =74 ╳ 52 =21 ╳ 50 =92 ╳ 54 =36 ╳ 33 =70 ╳ 98 =11 ╳ 32 =60 ╳ 58 =56 ╳ 57 =24 ╳ 85 =50 ╳ 75 =39 ╳ 66 =74 ╳ 95 =62 ╳ 11 =59 ╳ 22 =26 ╳ 51 =42 ╳ 9 =86 ╳ 6 =83 ╳ 34 =68 ╳ 51 =62 ╳ 28 =35 ╳ 28 =8 ╳ 62 =38 ╳ 88 =89 ╳ 99 =14 ╳ 12 =80 ╳ 69 =共计：100 题做对：计时：成绩：95 ╳ 71 =96 ╳ 6 =88 ╳ 41 =82 ╳ 69 =61 ╳ 3 =79 ╳ 18 =78 ╳ 11 =90 ╳ 60 =41 ╳ 72 =29 ╳ 20 =13 ╳ 72 =31 ╳ 98 =54 ╳ 71 =26 ╳ 97 =67 ╳ 50 =41 ╳ 69 =33 ╳ 54 =97 ╳ 61 =84 ╳ 46 =10 ╳ 9 =46 ╳ 63 =45 ╳ 49 =35 ╳ 49 =41 ╳ 16 =47 ╳ 75 =4 ╳ 42 =83 ╳ 93 =12 ╳ 73 =71 ╳ 81 =54 ╳ 60 =18 ╳ 64 =72 ╳ 8 =79 ╳ 2 =30 ╳ 6 =90 ╳ 41 =46 ╳ 4 =73 ╳ 3 =85 ╳ 45 =91 ╳ 39 =91 ╳ 5 =80 ╳ 56 =91 ╳ 20 =13 ╳ 51 =49 ╳ 97 =22 ╳ 2 =35 ╳ 96 =39 ╳ 47 =76 ╳ 39 =67 ╳ 67 =4 ╳ 10 =4 ╳ 82 =54 ╳ 66 =93 ╳ 52 =61 ╳ 44 =8 ╳ 16 =4 ╳ 34 =4 ╳ 37 =57 ╳ 41 =46 ╳ 19 =41 ╳ 81 =94 ╳ 87 =35 ╳ 50 =96 ╳ 65 =44 ╳ 27 =10 ╳ 10 =44 ╳ 17 =10 ╳ 4 =27 ╳ 68 =78 ╳ 2 =47 ╳ 25 =64 ╳ 75 =3 ╳ 96 =21 ╳ 60 =5 ╳ 55 =72 ╳ 11 =72 ╳ 82 =54 ╳ 93 =58 ╳ 87 =58 ╳ 1 =46 ╳ 8 =51 ╳ 37 =75 ╳ 88 =50 ╳ 93 =63 ╳ 74 =87 ╳ 98 =5 ╳ 74 =43 ╳ 72 =82 ╳ 88 =38 ╳ 19 =14 ╳ 89 =98 ╳ 14 =11 ╳ 46 =50 ╳ 12 =84 ╳ 76 =61 ╳ 93 =56 ╳ 10 =23 ╳ 63 =32 ╳ 92 =73 ╳ 80 =76 ╳ 38 =共计：100 题做对：计时：成绩：89 ╳ 24 =31 ╳ 60 =49 ╳ 61 =22 ╳ 69 =87 ╳ 84 =16 ╳ 82 =42 ╳ 50 =12 ╳ 32 =92 ╳ 15 =72 ╳ 49 =42 ╳ 83 =12 ╳ 15 =4 ╳ 89 =75 ╳ 59 =51 ╳ 21 =68 ╳ 41 =88 ╳ 64 =95 ╳ 14 =93 ╳ 73 =84 ╳ 36 =96 ╳ 77 =8 ╳ 79 =83 ╳ 16 =39 ╳ 66 =70 ╳ 45 =48 ╳ 76 =91 ╳ 56 =90 ╳ 26 =12 ╳ 99 =63 ╳ 5 =45 ╳ 27 =16 ╳ 39 =90 ╳ 46 =90 ╳ 38 =12 ╳ 80 =74 ╳ 70 =21 ╳ 55 =20 ╳ 81 =62 ╳ 70 =11 ╳ 63 =87 ╳ 76 =12 ╳ 61 =46 ╳ 24 =49 ╳ 30 =4 ╳ 19 =70 ╳ 25 =3 ╳ 34 =32 ╳ 15 =90 ╳ 31 =96 ╳ 86 =64 ╳ 85 =9 ╳ 87 =9 ╳ 9 =90 ╳ 16 =93 ╳ 16 =14 ╳ 2 =22 ╳ 68 =25 ╳ 37 =84 ╳ 9 =34 ╳ 99 =27 ╳ 36 =63 ╳ 92 =63 ╳ 34 =96 ╳ 93 =49 ╳ 64 =80 ╳ 37 =23 ╳ 96 =52 ╳ 47 =86 ╳ 99 =13 ╳ 70 =53 ╳ 58 =72 ╳ 12 =63 ╳ 60 =96 ╳ 12 =89 ╳ 82 =94 ╳ 79 =69 ╳ 81 =73 ╳ 67 =77 ╳ 69 =34 ╳ 15 =82 ╳ 9 =88 ╳ 55 =26 ╳ 2 =57 ╳ 96 =89 ╳ 1 =4 ╳ 39 =34 ╳ 98 =16 ╳ 98 =82 ╳ 52 =16 ╳ 71 =86 ╳ 78 =60 ╳ 57 =93 ╳ 38 =71 ╳ 24 =37 ╳ 14 =20 ╳ 50 =30 ╳ 30 =35 ╳ 46 =6 ╳ 20 =89 ╳ 94 =共计：100 题做对：计时：成绩：59 ╳ 96 =59 ╳ 31 =38 ╳ 49 =55 ╳ 62 =93 ╳ 25 =10 ╳ 68 =11 ╳ 28 =71 ╳ 29 =34 ╳ 16 =62 ╳ 33 =29 ╳ 77 =13 ╳ 82 =18 ╳ 48 =38 ╳ 73 =38 ╳ 50 =2 ╳ 86 =17 ╳ 68 =63 ╳ 66 =42 ╳ 90 =62 ╳ 20 =51 ╳ 38 =72 ╳ 79 =25 ╳ 45 =16 ╳ 19 =59 ╳ 90 =35 ╳ 96 =33 ╳ 85 =88 ╳ 6 =92 ╳ 36 =67 ╳ 22 =79 ╳ 48 =18 ╳ 2 =6 ╳ 22 =21 ╳ 50 =50 ╳ 71 =97 ╳ 69 =77 ╳ 49 =55 ╳ 94 =15 ╳ 40 =56 ╳ 97 =5 ╳ 54 =47 ╳ 12 =6 ╳ 41 =39 ╳ 44 =56 ╳ 45 =20 ╳ 73 =34 ╳ 90 =5 ╳ 54 =49 ╳ 31 =98 ╳ 35 =3 ╳ 47 =64 ╳ 52 =40 ╳ 5 =98 ╳ 15 =83 ╳ 36 =13 ╳ 82 =4 ╳ 9 =50 ╳ 14 =66 ╳ 86 =34 ╳ 47 =50 ╳ 52 =73 ╳ 96 =37 ╳ 31 =69 ╳ 28 =38 ╳ 91 =16 ╳ 62 =21 ╳ 26 =25 ╳ 16 =28 ╳ 43 =71 ╳ 10 =61 ╳ 97 =4 ╳ 27 =3 ╳ 69 =69 ╳ 1 =38 ╳ 45 =89 ╳ 16 =91 ╳ 14 =50 ╳ 60 =2 ╳ 98 =44 ╳ 6 =93 ╳ 73 =45 ╳ 19 =71 ╳ 55 =72 ╳ 78 =63 ╳ 37 =52 ╳ 27 =83 ╳ 83 =93 ╳ 18 =35 ╳ 75 =17 ╳ 22 =43 ╳ 13 =13 ╳ 60 =66 ╳ 33 =49 ╳ 33 =39 ╳ 69 =76 ╳ 40 =98 ╳ 4 =87 ╳ 90 =72 ╳ 27 =2 ╳ 29 =共计：100 题做对：计时：成绩：31 ╳ 1 =40 ╳ 28 =93 ╳ 1 =74 ╳ 32 =83 ╳ 77 =95 ╳ 61 =89 ╳ 84 =97 ╳ 21 =27 ╳ 40 =83 ╳ 18 =81 ╳ 78 =6 ╳ 42 =45 ╳ 20 =32 ╳ 14 =57 ╳ 35 =52 ╳ 25 =22 ╳ 76 =53 ╳ 1 =47 ╳ 64 =29 ╳ 70 =53 ╳ 7 =19 ╳ 39 =25 ╳ 68 =10 ╳ 45 =89 ╳ 66 =52 ╳ 91 =9 ╳ 38 =54 ╳ 27 =63 ╳ 62 =49 ╳ 10 =11 ╳ 43 =58 ╳ 4 =69 ╳ 6 =44 ╳ 90 =77 ╳ 40 =25 ╳ 86 =13 ╳ 78 =78 ╳ 40 =5 ╳ 9 =20 ╳ 17 =11 ╳ 95 =71 ╳ 71 =18 ╳ 18 =71 ╳ 80 =34 ╳ 13 =72 ╳ 35 =5 ╳ 15 =6 ╳ 45 =69 ╳ 82 =18 ╳ 82 =25 ╳ 39 =77 ╳ 48 =83 ╳ 34 =58 ╳ 32 =57 ╳ 41 =92 ╳ 80 =59 ╳ 87 =26 ╳ 27 =32 ╳ 62 =78 ╳ 18 =55 ╳ 37 =73 ╳ 27 =50 ╳ 99 =50 ╳ 41 =50 ╳ 80 =79 ╳ 98 =21 ╳ 98 =72 ╳ 25 =8 ╳ 42 =31 ╳ 42 =91 ╳ 42 =58 ╳ 5 =97 ╳ 1 =79 ╳ 25 =39 ╳ 1 =36 ╳ 69 =25 ╳ 31 =47 ╳ 44 =53 ╳ 87 =37 ╳ 73 =27 ╳ 58 =53 ╳ 28 =58 ╳ 42 =37 ╳ 63 =73 ╳ 15 =88 ╳ 20 =76 ╳ 47 =98 ╳ 84 =68 ╳ 70 =23 ╳ 59 =97 ╳ 39 =37 ╳ 89 =47 ╳ 22 =69 ╳ 97 =64 ╳ 94 =73 ╳ 49 =16 ╳ 40 =36 ╳ 63 =69 ╳ 17 =77 ╳ 12 =共计：100 题做对：计时：成绩：76 ╳ 48 =69 ╳ 63 =24 ╳ 7 =52 ╳ 72 =91 ╳ 33 =40 ╳ 71 =35 ╳ 24 =9 ╳ 93 =75 ╳ 28 =97 ╳ 23 =45 ╳ 27 =68 ╳ 8 =2 ╳ 87 =6 ╳ 71 =75 ╳ 95 =79 ╳ 23 =25 ╳ 8 =61 ╳ 20 =32 ╳ 71 =82 ╳ 80 =17 ╳ 67 =2 ╳ 83 =7 ╳ 14 =35 ╳ 7 =40 ╳ 1 =63 ╳ 64 =45 ╳ 62 =33 ╳ 58 =46 ╳ 87 =89 ╳ 35 =71 ╳ 63 =95 ╳ 71 =6 ╳ 3 =80 ╳ 26 =41 ╳ 96 =48 ╳ 89 =41 ╳ 45 =18 ╳ 27 =31 ╳ 96 =44 ╳ 47 =14 ╳ 66 =26 ╳ 58 =98 ╳ 86 =71 ╳ 80 =73 ╳ 69 =32 ╳ 40 =78 ╳ 78 =21 ╳ 24 =9 ╳ 78 =81 ╳ 10 =80 ╳ 94 =4 ╳ 25 =47 ╳ 91 =36 ╳ 7 =45 ╳ 37 =67 ╳ 85 =91 ╳ 16 =26 ╳ 91 =36 ╳ 49 =25 ╳ 93 =44 ╳ 17 =98 ╳ 65 =86 ╳ 65 =89 ╳ 92 =64 ╳ 88 =53 ╳ 93 =65 ╳ 49 =39 ╳ 19 =69 ╳ 15 =74 ╳ 83 =98 ╳ 27 =45 ╳ 40 =72 ╳ 83 =16 ╳ 43 =10 ╳ 32 =77 ╳ 52 =90 ╳ 52 =80 ╳ 66 =63 ╳ 74 =22 ╳ 76 =12 ╳ 59 =84 ╳ 21 =36 ╳ 16 =16 ╳ 8 =78 ╳ 4 =2 ╳ 80 =24 ╳ 98 =60 ╳ 64 =79 ╳ 57 =69 ╳ 98 =82 ╳ 30 =63 ╳ 49 =66 ╳ 88 =87 ╳ 16 =14 ╳ 31 =29 ╳ 97 =3 ╳ 26 =94 ╳ 70 =73 ╳ 25 =63 ╳ 67 =共计：100 题做对：计时：成绩：

二年级上册数学口算估算竞赛题

姓名：___________班级：____________分数：____________

一、口算

7×5＝ 4×7＝ 8×8＝ 51－40＝ 6×4=

4×7= 78－9＝ 9×5＝ 19+32＝ 6×5-3=

21＋64＝ 44－34= 3×6＝ 7×9＝ 8×2=

67＋19＝ 5×6＝ 46-8= 45＋16＝ 32+59-10＝

3×6＝ 45－42＝ 6×8＝ 91－57＝ 7×4=

6×7-9＝ 8×6＝ 29＋36＝ 73＋6＝ 6×9=

81－9＝ 8×9＝ 2×7＝ 37－10＝ 5×5＝

46＋40＝ 27＋16＝ 59－40= 7×3＝ 71-9=

50－22＝ 9×7＝ 26＋48＝ 29－7＝ 4×8＝

80＋19＝ 82－12＝ 80－43= 7×2-7＝ 6×7＝

35-7= 3×6= 3×7+9= 35+40= 6×2+9=

13+44= 16+64= 11+68= 20+86= 2×4=

16+65= 16+69= 4×9= 13+46= 16+66=

20+78= 2×6= 11+89= 11+25= 11+9=

8×4= 21+90= 4×3= 13+49= 11+78=

11+27= 6×6= 21+62= 16+70= 4×7=

17+71= 11+28= 5×6= 4×5= 13+51=

6×8= 7×9= 23+25= 17+72= 14+52=

11+30= 21+54= 3×7= 11+18= 11+31=

7×3= 17+73= 23+27= 17+75= 22+37=

18+82= 12+34= 4×8= 5×2= 18+76=

二、估算

35+11≈ 56+12≈ 87-53≈ 25+11≈ 32+11≈

13+33≈ 77-40≈ 10+39≈ 55-41≈ 12+29≈

29+12≈ 13+19≈ 14+16≈ 63+14≈ 19+10≈