小脑瓜,转起来!
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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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7005941

小脑瓜,转起来!

40 ×4 60 ×5

30 ×3 200 ×7

24 ×2 22 ×4

13 ×3 40 ×80


7005941

整十整百数乘整十数

三年级下册

执教者:唐红艳


7005941

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。


7005941

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。


7005941

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。


7005941

我的算法

9000

3

×

=

先算3×3=

60×30=

1800

先算6×3=

18


7005941

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


7005941

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。


7005941

谢谢指导!


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