四年级上册数学:商的变化规律简便运算

四年级上册数学:商的变化规律简便运算


简介:
1200÷25 =(1200×4)÷(25×4) =4800÷100 =48 240÷12 =(240÷6)÷(12÷6) =40÷2 =20 120÷15 =(120×2)÷(15×2) =240÷30 =8 5400÷600 =(5400÷100)÷(600÷100) =54÷6 =9 280÷35 =(280×2)÷(35×2) =560÷70 =8 210÷42 =(210÷7)÷(42÷7) =30÷6 =5 4200÷60÷70 =4200÷ (60×70) =4200÷4200 =1 150÷25 =(150×4)÷(25×4) =600÷100 =6