五年级 乘除法简便计算.docx

五年级 乘除法简便计算五年级第一讲 小数乘除法简便计算专项练习 ×16 23.9-0.6×0.6-0.64 一、计算训练A 1.25×3.2×0.25 4.7×1.25×1.6 1.25×88 1.25×6.4×0.25 4.6×0.35+4.6×0.65 2.55×1.5+1.5+6.45×1.5 2.95×101-2.95 12.5×5×0.16 3.2×10.1 0.52×105 10.01×4.5 1.8×0.9+0.18 5.4×0.68+3.4×2×0.46 8.9×9.9+11×0.99 3.7×0.44×2.5 0.7777×0.7+0.1111×2.1 二、计算训练B 92×0.9+7.2 1.87×9.90.187 7.2×0.22.4×1.4 1.9×8.80.88 888×1.6+222×3.6 4.8×7.878×0.52 3.14×0.6831.4×0.032 4.2×988.4 12.7×9.91.27 2.3×16+2.3×23+2.3 3.65×4.736.5×0.37 101×0.87-0.91×87 0.125×72 46×0.33+54×0.33 6.81+6.81×99 9.5×99 三、脱式计算 2.5×7.1×4 16.12×9916.12 5.2×0.90.9 7.28×99+7.28 4.3×50×0.2 26×15.715.7×24 56.5×9956.5 4.8×100.1 7.09×10.80.8×7.09 9.5×101 8.7 × 17.4 - 8.7 × 7.4 4.4×0.83.4×0.8 (9.37+9.37+9.37+9.37)× 25 4.2.×1.254.2×1.75 2.37×6.3+2.37×3.7 2.5×1.25×0.32 3.8×10.1 7.69×101 3.8×10.1 0.25×39+0.25 四、填空：7.07÷0.3商是23.5，余数是 五、解答题 两个数相乘，小马虎把第一因数30.95中的9写成了6，结果积比正确答案少0.81，那么另一个因数是多少？