四上数学.商不变的规律.常见简便计算
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简介
✧将除数转化为整百、整十数计算 2400÷25 =(2400×4)÷(25×4) =9600÷100 =96 1200÷15 =(1200×2)÷(15×2) =2400÷30 =80 500÷125 =(500×8)÷(125×8) =4000÷1000 =4 ✧将除数转化为一位数计算 270÷54 =(270÷9)÷(54÷9) =30÷6 =5 450÷18 =(450÷9)÷(18÷9) =50÷2 =25 640÷32 =(640÷8)÷(32÷8) =80÷4 =20 ✧一个数连续除以两个数 7600÷25÷4 =7600÷(25×4) =7600÷100 =76 54000÷8÷125 =54000÷(8×125) =54000÷1000 =54 6700÷5÷20 =6700÷(5×20) =6700÷100 =67
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