四年级上册数学商不变的规律
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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 ★将除数转化为一位教计算 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 ★一个数连续陈以两个数 7600÷25÷4 =7600÷(25×4) =7600÷100 =76 5400÷8÷125 =5400÷(8×125) =5400÷1000 =54 6700÷5÷20 =6700÷(5×20) =6700÷100 =67 ★一个数除以两个教的积 180÷(3×5) =180÷3÷5 =60÷5 =12 480÷32 =480÷(8×4) =480÷8÷4 =60÷4 =15 360÷72 =360÷(8×9) =360÷9÷8 =40÷8 =5
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