第四课乘法
- 2. 乘法表
1×2=2 1×3=3
2×2=4 2×3=6
3×2=6 3×3=9
4×2=8 4 × 3 = 12
5 × 2 = 10 5 × 3 = 15
6 × 2 = 12 6 × 3 = 18
7 × 2 = 14 7 × 3 = 21
8 × 2 = 16 8 × 3 = 24
9 × 2 = 18 9 × 3 = 28
10 × 2 = 20 10 × 3 = 30
11 × 2 = 22 11 × 3 = 33
12 × 2 = 24 12 × 3 = 36
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- 3. 乘法表
1×4=4 1×5= 5
2×4=8 2 × 5 = 10
3 × 4 = 12 3 × 5 = 15
4 × 4 = 16 4 × 5 = 20
5 × 4 = 20 5 × 5 = 25
6 × 4 = 24 6 × 5 = 30
7 × 4 = 28 7 × 5 = 35
8 × 4 = 32 8 × 5 = 40
9 × 4 = 36 9 × 5 = 45
10 × 4 = 40 10 × 5 = 50
11 × 4 = 44 11 × 5 = 55
12 × 4 = 48 12 × 5 = 60
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- 4. 认识乘法
写成：2 × 3 = 6 ---- 数字
读成：二乘于三等于六 ---- 文字
写成：5 × 4 = 20 ---- 数字
读成：五乘于四等于二十 --- 文字
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- 5. 认识乘法和加法的关系
4+4+4
组 3组4
3X4
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- 6. 4+ 4 + 4
3组4
3X4
2+2+2+2+2+2
6组2
6X2
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- 8. 3 个 5 = 15
3 X 5 = 15
3个3=9
3X3=9
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- 9. 练习
• 7X2= • 6X3=
3X4= 8X2=
6X5=
4X5=
9X3=
6X4=
10 X 2 =
7X3=
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