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小脑瓜，转起来！

小脑瓜，转起来！. 40 × 4 60 × 5 30 × 3 200 × 7 24 × 2 22 × 4 13 × 3 40 × 80. 整十整百数乘整十数. 三年级下册 执教者：唐红艳. 你每天送多少份报纸 ? 多少封信？. 我平均每天要送 300 份报纸 , 60 封信。. 那 1 ０天该送多少份报纸？多少封信呀？. 300×10=. 3000 （份）. 600 （封）.

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小脑瓜，转起来！

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  1. 小脑瓜，转起来！ 40 ×4 60 ×5 30 ×3 200 ×7 24 ×2 22 ×4 13 ×3 40 ×80

  2. 整十整百数乘整十数 三年级下册 执教者：唐红艳

  3. 你每天送多少份报纸?多少封信？ 我平均每天要送300份报纸,60封信。

  4. 那1０天该送多少份报纸？多少封信呀？ 300×10= 3000（份） 600（封） 60×10= 答：邮递员叔叔工作10天要送3000份报纸，600封信。

  5. 小结：两个因数末尾都有0的乘法，口算时只要把0前面的数相乘，再看两个因数的末尾一共有几个0，就在乘得的积末尾添上几个0。小结：两个因数末尾都有0的乘法，口算时只要把0前面的数相乘，再看两个因数的末尾一共有几个0，就在乘得的积末尾添上几个0。

  6. 我的算法 ３ ９000 3 × = 先算3×３= ９ 60×30= 1800 先算6×3= 18

  7. 看谁算得快又准 80 ×10= 60 ×20= 50 × 70= 30 ×80= 700 ×20= 500 ×30= 42 ×10= 23 ×20= 800 1200 2400 3500 14000 15000 420 460

  8. 两个因数末尾都有0的乘法，口算时只要把0前面的数相乘，再看两个因数的末尾一共有几个0，就在乘得的积末尾添上几个0。两个因数末尾都有0的乘法，口算时只要把0前面的数相乘，再看两个因数的末尾一共有几个0，就在乘得的积末尾添上几个0。

  9. 谢谢指导！

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