不进位两位数乘两位数课件(共15张PPT)苏教版三年级下册数学
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| 名称 | 不进位两位数乘两位数课件(共15张PPT)苏教版三年级下册数学 |  | |
| 格式 | pptx | ||
| 文件大小 | 2.8MB | ||
| 资源类型 | 教案 | ||
| 版本资源 | 苏教版 | ||
| 科目 | 数学 | ||
| 更新时间 | 2023-01-15 17:20:00 | ||
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(共15张PPT)
两位数乘两位数的笔算
● ● ● ● ● ● ● ● ● ● ●
11个
1
2
3
4
5
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6
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7
● ● ● ● ● ● ● ● ● ● ●
8
● ● ● ● ● ● ● ● ● ● ●
9
● ● ● ● ● ● ● ● ● ● ●
10
11X10=110
幼儿园购进12箱迷你南瓜，每箱24个。
一共有多少个？
1 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
2 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
3 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
4 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
5 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
6 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
7 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
8 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
9 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
10 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
11 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
12 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
24个
1 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
2 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
3 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
4 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
5 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
6 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
7 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
8 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
9 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
10 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
11 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
12 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
24个
10个24
2个24
方法一： 2×6=12
先把24×12变成24×2×6
24×2=48,48×6=288
方法二：12箱可以分成2箱和10箱。
24×2=48（个）
24×10=240（个）
48+240=288(个）
4 8
2 4
×
1
2 4
2 8 8
24×2的积
24×10的积
2
可以用竖式计算！
0
个位上的0可以不写
4 8
2 4
×
1
2 4
2 8 8
2
一般写成这样的
形式！
2.列竖式计算，并验算：
学校买21个热水瓶，每个23元。根据下面的竖式，在（ ）里填合适的数。
2 3
Χ 2 1
2 3 …买（ ）个热水瓶应付（ ）元
4 6 …买（ ）个热水瓶应付（ ）元
4 8 3 …买（ ）个热水瓶应付（ ）元
20
1
23
460
21
483
14×21＝42
1 4
×2 1
14×21＝
1 4
× 2 1
2 8
1 4
4 2
1 4
2 8
2 9 4
小马虎体检中心
294
32×23＝294
3 1
×2 3
32×23＝
3 2
×2 3
6 2
6 3
6 8 3
9 6
6 4
7 3 3
小马虎体检中心
733
谢谢大家
两位数乘两位数的笔算
● ● ● ● ● ● ● ● ● ● ●
11个
1
2
3
4
5
● ● ● ● ● ● ● ● ● ● ●
● ● ● ● ● ● ● ● ● ● ●
● ● ● ● ● ● ● ● ● ● ●
● ● ● ● ● ● ● ● ● ● ●
● ● ● ● ● ● ● ● ● ● ●
6
● ● ● ● ● ● ● ● ● ● ●
7
● ● ● ● ● ● ● ● ● ● ●
8
● ● ● ● ● ● ● ● ● ● ●
9
● ● ● ● ● ● ● ● ● ● ●
10
11X10=110
幼儿园购进12箱迷你南瓜，每箱24个。
一共有多少个？
1 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
2 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
3 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
4 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
5 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
6 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
7 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
8 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
9 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
10 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
11 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
12 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
24个
1 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
2 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
3 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
4 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
5 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
6 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
7 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
8 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
9 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
10 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
11 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
12 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
24个
10个24
2个24
方法一： 2×6=12
先把24×12变成24×2×6
24×2=48,48×6=288
方法二：12箱可以分成2箱和10箱。
24×2=48（个）
24×10=240（个）
48+240=288(个）
4 8
2 4
×
1
2 4
2 8 8
24×2的积
24×10的积
2
可以用竖式计算！
0
个位上的0可以不写
4 8
2 4
×
1
2 4
2 8 8
2
一般写成这样的
形式！
2.列竖式计算，并验算：
学校买21个热水瓶，每个23元。根据下面的竖式，在（ ）里填合适的数。
2 3
Χ 2 1
2 3 …买（ ）个热水瓶应付（ ）元
4 6 …买（ ）个热水瓶应付（ ）元
4 8 3 …买（ ）个热水瓶应付（ ）元
20
1
23
460
21
483
14×21＝42
1 4
×2 1
14×21＝
1 4
× 2 1
2 8
1 4
4 2
1 4
2 8
2 9 4
小马虎体检中心
294
32×23＝294
3 1
×2 3
32×23＝
3 2
×2 3
6 2
6 3
6 8 3
9 6
6 4
7 3 3
小马虎体检中心
733
谢谢大家