五年级上册小数乘法计算
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简介
一、小数乘法口算 0.2×3=0.6 0.5×4=2 1.2×2=2.4 2.5×2=5 0.3×0.3=0.09 1.1×3=3.3 0.7×0.1=0.07 3×0.6=1.8 0.25×4=1 0.8×5=4 5×0.12=0.6 1.4×2=2.8 0.1×9=0.9 1.5×2=3 2.1×3=6.3 二、小数乘法混合运算 3.2×2+1.5 =6.4+1.5 =7.9 7.8−2.4×3 =7.8−7.2 =0.6 1.5×4+6.8 =6+6.8 =12.8 9.5−1.2×5 =9.5−6 =3.5 2.6×3−4.1 =7.8−4.1 =3.7 4.2+1.8×5 =4.2+9 =13.2 三、小数乘法简便运算 2.5×3.7×4 =2.5×4×3.7 =10×3.7 =37 1.25×(0.8×4.2) =1.25×0.8×4.2 =1×4.2 =4.2 3.6×101 =3.6×(100+1) =3.6×100+3.6×1 =360+3.6 =363.6 7.2×4.5+2.8×4.5 =(7.2+2.8)×4.5 =10×4.5 =45
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