五年级第一讲小数乘除法简便计算专项练习(一)
欧阳家百(2021.03.07)
一、计算训练A
⑴1.25×3.2×0.25 ⑵4.7×1.25×1.6 ⑶1.25×88 ⑷1.25×6.4×0.25 ⑸4.6×0.35+4.6×0.65
⑹2.55×1.5+1.5+6.45×1.5 ⑺2.95×101-2.95 ⑻12.5×5×0.16⑼3.2×10.1 ⑽0.52×105 ⑾10.01×4.5 (12)1.8×0.9+0.18
⒁5.4×0.68+3.4×2×0.46⒂8.9×9.9+11×0.99 ⒃(1.25+0.25)×16 ⒄23.9-0.6×0.6-0.64 ⒅3.7×0.44×2.5⒆1.9×8.8+0.88
⒇0.7777×0.7+0.1111×2.1 888×1.6+222×3.6
欧阳索引创编 2021.02.02
二、计算训练B
⑴92×0.9+7.2 ⑵4.8×7.8+78×0.52
⑶1.87×9.9+0.187 ⑷3.14×0.68+31.4×0.032 ⑸7.2×0.2+2.4×1.4 ⑹4.2×98+8.4
⑺12.7×9.9+1.27 ⑻2.3×16+2.3×23+2.3 ⑼3.65×4.7-36.5×0.37⑽101×0.87-0.91×87 ⑾0.125×72 ⑿46×0.33+54×0.33 ⒀6.81+6.81×99 ⒁9.5×99
三、脱式计算(能简算的要简算)
⑴2.5×7.1×4 ⑵16.12×99+16.12 ⑶5.2×0.9+0.9
⑷7.28×99+7.28 ⑸4.3×50×0.2⑹26×15.7+15.7×24
欧阳索引创编 2021.02.02
⑺56.5×99+56.5 ⑻4.8×100.1⑼ 7.09×10.8-0.8×7.09
⑽9.5×101 ⑾8.7 × 17.4 - 8.7 × 7.4 ⑿4.4×0.8-3.4×0.8
⒀(9.37+9.37+9.37+9.37)× 2.5 ⒁4.2.×1.25+4.2×1.75
⒂2.37×6.3+2.37×3.7 ⒃2.5×1.25×0.32 ⒄3.8×10.1
⒅7.69×101 ⒆3.8×10.1 ⒇0.25×39+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
欧阳索引创编 2021.02.02
因数是多少?
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