二年级下册数学课件《2、100以内两位数减两位数的口算》课件(1) 苏教版(共31张PPT)

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名称 二年级下册数学课件《2、100以内两位数减两位数的口算》课件(1) 苏教版(共31张PPT)
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文件大小 10.0MB
资源类型 教案
版本资源 苏教版
科目 数学
更新时间 2020-05-03 19:50:00

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文档简介

(共31张PPT)
两位数减两位数的口算


45-20 =
67-30 =
25
37

45- 3 =
67- 8 =
42
59
五十几个
二十几个

小灰兔比小白兔多摘多少个?

5□-2□
研究问题:

5□-2□

想:
5□-20=3□
3□-□=□□
拔萝卜
第一关

57-30 =
27- 2 =
57-32 =


76-60 =
16- 8 =




40-23 =


76-68 = 8

27
25
25
16
8
40-20 = 20
20- 3 = 17
17

3
30
2
2
摘蘑菇
第二关

93-57 =
93-53 =

75-29 =
75-23 =

50-27 =
50-24 =
40
36
52
46
26
23
3
5
4
4
2
2


93-57 =
93-53 =
幸运抽题
第三关
53-16
67-35
37-35
94-38
23-12
89-45
30-24
62-36
44-18
35-28
88-28
67-35
94-38
80-45
34-18
42-23
84-16
51-26
77-68 54-16
77-35
47-35
84-38
23-12
99-45
70-24
62-36
34-18
55-28
68-28
47-35 53-16
67-35
37-35
94-38
23-12
89-45
30-24
62-36
44-18
35-28
88-28
67-35
94-38
80-45
34-18
42-23
84-16
51-26
77-68 54-16
77-35
47-35
84-38
23-12
99-45
70-24
62-36
34-18
55-28
68-28
47-35
54-38
60-45
34-18
42-23
84-16
79-22
67-35





53-16
67-35
37-35
94-38
23-12
89-45
30-24
62-36
44-18
35-28
88-28
67-35
94-38
80-45
34-18
42-23
84-16
51-26
77-68 54-16
77-35
47-35
84-38
23-12
99-45
70-24
62-36
34-18
55-28
68-28
47-35 53-16
67-35
37-35
94-38
23-12
89-45
30-24
62-36
44-18
35-28
88-28
67-35
94-38
80-45
34-18
42-23
84-16
51-26
77-68 54-16
77-35
47-35
84-38
23-12
99-45
70-24
62-36
34-18
55-28
68-28
47-35
54-38
60-45
34-18
42-23
84-16
79-22
-35





64-38
53-16
67-35
37-35
94-38
23-12
89-45
30-24
62-36
44-18
35-28
88-28
67-35
94-38
80-45
34-18
42-23
84-16
51-26
77-68 54-16
77-35
47-35
84-38
23-12
99-45
70-24
62-36
34-18
55-28
68-28
47-35 53-16
67-35
37-35
94-38
23-12
89-45
30-24
62-36
44-18
35-28
88-28
67-35
94-38
80-45
34-18
42-23
84-16
51-26
77-68 54-16
77-35
47-35
84-38
23-12
99-45
70-24
62-36
34-18
55-28
68-28
47-35
54-38
60-45
34-18
42-23
84-16
79-22





89-16
53-16
67-35
37-35
94-38
23-12
89-45
30-24
62-36
44-18
35-28
88-28
67-35
94-38
80-45
34-18
42-23
84-16
51-26
77-68 54-16
77-35
47-35
84-38
23-12
99-45
70-24
62-36
34-18
55-28
68-28
47-35 53-16
67-35
37-35
94-38
23-12
89-45
30-24
62-36
44-18
35-28
88-28
67-35
94-38
80-45
34-18
42-23
84-16
51-26
77-68 54-16
77-35
47-35
84-38
23-12
99-45
70-24
62-36
34-18
55-28
68-28
47-35
54-38
60-45
34-18
42-23
84-16
79-22
67-35





70-35
53-16
67-35
37-35
94-38
23-12
89-45
30-24
62-36
44-18
35-28
88-28
67-35
94-38
80-45
34-18
42-23
84-16
51-26
77-68 54-16
77-35
47-35
84-38
23-12
99-45
70-24
62-36
34-18
55-28
68-28
47-35 53-16
67-35
37-35
94-38
23-12
89-45
30-24
62-36
44-18
35-28
88-28
67-35
94-38
80-45
34-18
42-23
84-16
51-26
77-68 54-16
77-35
47-35
84-38
23-12
99-45
70-24
62-36
34-18
55-28
68-28
47-35
54-38
60-45
34-18
42-23
84-16
79-22





72-19
口算擂台
第四关
只写得数

54-12

50-26

48-19

73-45
只写得数
42
24
29
28

54-12

50-26

48-19

73-45
设计密码
第五关


□□-□□=4□
凭密码入场:

73-31
是四十多吗?

通过


不通过


73-28
是四十多吗?

通过


不通过


53-2□
是四十多吗?

通过


不通过


72-2□
是四十多吗?
3

通过


不通过

1

通过

通过

通过

通过

通过

森林运动会







5□ - 2□



20



3□