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五年级上册小数乘除法的简便运算方法下载(含练习)

  • 2026-01-12 13:05:14
五年级上册小数乘除法的简便运算方法下载(含练习)

小数乘法的简便运算

一、乘法交换律与结合律的运用。

提示1:以下计算中,有的需要把一个小数拆成两个数相乘,要注意拆分后两数相乘的大小应该与原数相等,特别是小数的位数。如3.2=0.8×4

3.2=0.4×8  0.32=0.04×8  0.32=0.08×45.6=0.8×7    5.6=0.7×8

0.56 =0.07×8   0.56 =0.08×70.48=0.12×4   0.48=0.04×12

提示2:应用乘法结合律解题的口诀是连乘用结合

提示3:应用乘法结合律解题的格式是a×b×c=a×(b×c)最后一个步骤是“×”,不要看成是“+”.  如  2.5×0.48=2.5×0.04×12=0.1×12=1.2

A组  4.56×0.4×2.5   12.5×2.7×0.8   12.5×3.2×0.25

B组   2.5×0.48       12.5×5.6          25×0.36

二、乘法分配律的运用。

提示1:A组中的一个因数都具备一个特点,都接近整数1、10、100等,这样的数就可以拆分成两个数相加或者相减。

如  10.4=(10+0.4)  9.9=(10-0.9)    0.99=(10-0.01)

但也有这样的数  8.8=(8+0.8)  4.4=(4+0.4)  0.48=(0.4+0.08)

提示2:应用乘法分配律解题的口诀是乘加乘减用分配

提示3:应用乘法分配律解题的格式是(a+b)×c=a×c+b×c最后一个步骤是“+”,不要看成是“×”.

如  2.5×0.48=2.5×(0.4+0.08)=2.5×0.4+2.5×0.08=1 + 0.2=1.2

不是 =1 + 0.2=  2

提示4:应用乘法分配律解题的最后一步,有时是数字比较大的两个数相加减,口算容易出错,这时就要打草稿竖式计算。

A组    0.25×10.4          12.5×8.8            9.9×0.35

B组   3.7×1.8-2.7×1.8   95.7×0.28+6.3×0.28-0.28×2   1.08×9+1.08

三、比较乘法结合律与分配律在简便运算时的区别。

下面各题用两种方法简算。

12.5×8.8         12.5×8.80.25×4.8      0.25×4.8

四、变一变,能简算。

48×0.56+44×0.48

我来试一试:

0.279×343+0.657×2790.264×519+264×0.4819.16×1.53-0.053×91.6

五、拓展提高。

99.99×0.8+11.11×2.8314×0.043+3.14×7.2-31.4×0.15

小数除法的简便运算

小数除法的简便计算与整数除法的简便计算一样,用到的是除法性质。

除法性质1、A ÷ B ÷ C = A ÷ ( B × C )

如:42÷2.8 =42÷( 0.7 × 4 )= 42 ÷ 0.7 ÷ 4 = 60 ÷ 4 = 15

如:420÷2.5÷4 = 420÷(2.5×4 )= 420 ÷ 10 = 42

除法性质2、   (a-b)÷c=a÷c-b÷c

除法性质3、  A ÷ ( B ÷ C ) = A ÷ B × C

除法性质4、  A × ( B ÷ C ) =  A × B ÷ C

小数乘除法的递等式计算

小数乘除法的递等式计算方法与整数的一样,能简便的要简便,

但也有的是不能简便比如:  3.6+6.4×0.5   不能掉进先加后乘的陷阱里。

3.6×5+15×6.4  不能掉进应用乘法分配率的陷阱里。

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  1. CONNECT:[ UseTime:0.000682s ] mysql:host=127.0.0.1;port=3306;dbname=no_yeyulingfeng;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000932s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000328s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.008463s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000789s ]
  6. SELECT * FROM `set` [ RunTime:0.001641s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000541s ]
  8. SELECT * FROM `article` WHERE `id` = 460633 LIMIT 1 [ RunTime:0.007049s ]
  9. UPDATE `article` SET `lasttime` = 1768209569 WHERE `id` = 460633 [ RunTime:0.015659s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000968s ]
  11. SELECT * FROM `article` WHERE `id` < 460633 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000425s ]
  12. SELECT * FROM `article` WHERE `id` > 460633 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005454s ]
  13. SELECT * FROM `article` WHERE `id` < 460633 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000687s ]
  14. SELECT * FROM `article` WHERE `id` < 460633 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000803s ]
  15. SELECT * FROM `article` WHERE `id` < 460633 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002399s ]
0.124944s