1 / 9

除 法 简 便 运 算

除 法 简 便 运 算. 马坡岭小学:颜林. 一共有 25 个小组,每个小组种了 5 棵树,购买树苗花了 1250 元,每棵树苗多少钱?. 1250÷25÷5 =1250÷ ( 25×5 ) =1250 ÷125 =10 (元). 1250÷25÷5 =1250÷5÷25 =250 ÷25 =10 (元). 答:每棵树苗 10 元。. 除法交换律: 一个数连续除以两个数,可以先除以后一个数,再除以前一个数,商不变 。 a ÷ b ÷ c=a ÷ c ÷ b 除法结合律 : 一个数连续除以去两个数,可以除去这两个数的积,商不变。

Télécharger la présentation

除 法 简 便 运 算

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. 除 法 简 便 运 算 马坡岭小学:颜林

  2. 一共有25个小组,每个小组种了5棵树,购买树苗花了1250元,每棵树苗多少钱?一共有25个小组,每个小组种了5棵树,购买树苗花了1250元,每棵树苗多少钱? 1250÷25÷5 =1250÷(25×5) =1250 ÷125 =10(元) 1250÷25÷5 =1250÷5÷25 =250 ÷25 =10(元) 答:每棵树苗10元。

  3. 除法交换律: 一个数连续除以两个数,可以先除以后一个数,再除以前一个数,商不变。 a÷b÷c=a÷c÷b 除法结合律: 一个数连续除以去两个数,可以除去这两个数的积,商不变。 a÷b÷c=a÷(b×c)

  4. 练一练: 9800÷25÷4 3600÷ 25 ÷8 840÷5÷6 9000÷125÷8 1250÷(125÷9 ) 400÷25 420÷28 7392÷8-6592÷8 (72-48)÷8 103× 96 ÷6 2600 ÷25

  5. 6237÷63 =(6300- 63)÷63 =6300÷63- 63÷63 =100-1 =99

  6. 9999×9999+19999 222×999+333×334

  7. 29+299+2999+29999 5678+426+2468+574+7532+4322 8118÷82 99999×77778+33333×66666

  8. 找规律计算: 73-37=(7-3)×9=4×9=36 64-46=(6-4)×9=2×9=18 92-29=(9-2)×9=7×9=63 87- 78=(8-7)×9=1×9=9 74- =(7- )×9= ×9= 4 36 47 3

  9. 找规律计算: 1999998÷9=222222 2999997÷9=333333 3999996÷9=444444 4999995÷9=555555 ( )÷9=666666 ( )÷9=888888 5999994 7999992

More Related