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看谁算得巧

看谁算得巧. 运用整数的运算性质填空: 1 ) 3600÷25÷4 = 3600÷ ( 25 ○ □ ). × 4. 43 ÷ 2. 2 ) 86÷ ( 43×2 ) = 86÷ □ ○ □. 3 ) 420÷70= ( 420÷10 ) ÷ ( 70 ○ □ ). ÷ 10. 4 )○ □ 3 = 27÷9 = 54÷ ○. 9 ÷. 18. 运用了除法的运算性质和商不变的性质. 用多种方法计算下题 : 1100 是 25 的多少倍?. 运用除法运算性质和商不变性质,根据 除数 的特点选择简便运算的方法可以使计算简便。.

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看谁算得巧

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  1. 看谁算得巧

  2. 运用整数的运算性质填空: 1)3600÷25÷4 = 3600÷(25 ○ □ ) × 4 43 ÷ 2 2)86÷(43×2)= 86÷ □ ○ □ 3)420÷70=(420÷10)÷(70 ○ □) ÷ 10 4)○ □ 3 = 27÷9 = 54÷ ○ 9 ÷ 18 运用了除法的运算性质和商不变的性质

  3. 用多种方法计算下题: 1100是25的多少倍?

  4. 运用除法运算性质和商不变性质,根据除数的特点选择简便运算的方法可以使计算简便。运用除法运算性质和商不变性质,根据除数的特点选择简便运算的方法可以使计算简便。

  5. 试一试 • 把算式填完整: • 4800÷32 • =4800÷(×) • =4800÷÷ • = • = 8 4 8 4 600÷4 150

  6. 试一试 • 把算式填完整: • 48000÷125 • =(48000×)÷(125×) • = • = 8 8 384000÷1000 384

  7. 当除数是5、25、125时,可以使用商不变的性质把被除数和除数同时乘2、4或8使除数得到10、100、1000这样计算简单。

  8. 练一练: 用25、36、45和72分别去除1800,商各是多少? (怎样简便就怎样算)

  9. 判断:下面巧算方法对吗? (1)725÷25 = 725÷(25×4) ( ) =(725×4)÷(25×4) × × (2)48×25 =(48×4)×(25×4) ( ) = 12×(4×25) (3)1326÷39 = 1326÷13×3 ( ) = 1326÷13÷3 × √ (4)15000÷125 = 15×(1000÷125)( )

  10. 想一想,说一说,做一做。 • 32000÷125 • 32000×125 • ② 3200÷64 • 3200÷25 • 3200÷25÷4

  11. 谢谢!

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