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笔算乘法

全日制聋校实验教材 数学 第六册. 笔算乘法. 一位数乘三、四位数. 授课教师： 陶新华. 复习. 1. 背乘法口诀. 2. 口算. 5×3 ＋ 6 ＝ 2×9 ＋ 7 ＝ 6×8 ＋ 3 ＝ 4×7 ＋ 5 ＝ 3×8 ＋ 4 ＝ 5×7 ＋ 6 ＝. 21. 62. 8×7 ＋ 5 ＝ 4×9 ＋ 2 ＝ 7×9 ＋ 8 ＝ 8×3 ＋ 7 ＝ 3×6 ＋ 3 ＝. 61. 6×9 ＋ 8 ＝ 4×6 ＋ 7 ＝ 9×3 ＋ 6 ＝. 25. 31. 38. 51. 71. 33. 31. 33. 28. 21.

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笔算乘法

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  1. 全日制聋校实验教材 数学 第六册 笔算乘法 一位数乘三、四位数 授课教师： 陶新华

  2. 复习 1.背乘法口诀 2.口算 5×3＋6＝ 2×9＋7＝ 6×8＋3＝ 4×7＋5＝ 3×8＋4＝ 5×7＋6＝ 21 62 8×7＋5＝ 4×9＋2＝ 7×9＋8＝ 8×3＋7＝ 3×6＋3＝ 61 6×9＋8＝ 4×6＋7＝ 9×3＋6＝ 25 31 38 51 71 33 31 33 28 21 41

  3. 探究新知 例5：192×4 = 768 1 9 2 4 × 3 7 8 6 可以用竖式计算！

  4. 乘法法则 • 乘数是一位数的乘法法则： • 从个位起，用乘数依次乘被乘数的每一位数； • 哪一位上乘得的积满几十，就向前一位进几。

  5. 巩固练习: 234×2 = 468 141×5 = 705 263×3 = 789

  6. 例6：1832×3 = 5496 1 8 3 2 3 × 2 6 4 9 5

  7. 巩固练习 1512×4 = 6048 2318×3 = 6954 2162×4 = 8648

  8. 下面的计算对吗？把不对的改正过来。 715×4 = 2840 126×3 = 368 7 1 5 1 2 6 4 3 × × 2 8 4 0 3 6 8

  9. 课堂小结 今天我们学习了一位数乘三、四位数的乘法 乘数是一位数的乘法法则： 1.从个位起，用乘数依次乘被乘数的每一位数； 2.哪一位上乘得的积满几十，就向前一位进几。

  10. 作业 ①P13. 7. ②P14. 12. 15.

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