四升五年级数学小数乘法的简便计算

四升五年级数学小数乘法的简便计算


简介:
(1)16×12.5×4.3 =2×8×12.5×4.3 =(2×4.3)×(8×12.5) =8.6×100 =860 (2)8.2×99+8.2 =8.2×(99+1) =8.2×100 =820 (3)8.8×12.5 =(8+0.8)×12.5 =100+10