小數(shù)乘法簡便運算練習(xí)題.doc

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. ??小數(shù)乘法簡便運算練習(xí)題 ?一、簡便運算? 0.25×8.5×4????????12.5×0.96×0.8??0.25×0.73×4?????4.36×12.5×8?????0.25×16.2×4???????1.25×2.5×32???3.2×0.25×12.5?????0.25×36??? 二、簡便運算? (1.25－0.125)×8?????? ?4.8×10.1???? 3.6×102?????????? ?0.39×199?????0.32×403????????????? ?3.65×10.1?????????0.85×9.9??? 三、簡便運算? 3.72×3.5＋6.28×3.5????? ?15.6×2.1－15.6×1.1????? ?3.83×4.56＋3.83×5.44????????? 56.5×99＋56.5???????? 7.09×10.8－0.8×7.09??????????? 9.7×99＋9.7??? ?4.2×99＋4.2??????????? ?27.5×3.7－7.5×3.7????????? ??3.9×2.7＋3.9×7.3??? 四、簡便運算? 2.3×16+2.3×23+2.3???????????? ?5.4×11-5.4????????? 10.7×16.1-15.1×10.7??? 7.74×（2.8－1.3）＋1.5×2.26?????? 10.6×0.35－9.6×0.35???? 7.6×0.8＋0.2×7.6?? 五、簡便運算? ??1.28×8.6＋0.72×8.6????? 0.65×101?????????8.9×1.01????????? 六、簡便運算? ?4.8×7.8＋78×0.52????????? 1.87×9.9＋0.187??????? 3.14×0.68＋31.4×0.032???????? 12.7×9.9＋1.27??????? 3.65×4.7?－36.5×0.37??????? 101×0.87-0.91×87???? ?七、用簡便方法計算? ??6.66×3.3+6.66×6.7????? 7.2×0.2＋2.4×1.4????????? ?46×57＋23×86 小數(shù)乘法簡便計算練習(xí)題 小數(shù)乘法的簡便計算的方法： 1、乘法交換律與結(jié)合律、分配率的運用。（整數(shù)的運算定律在小數(shù)中同樣適用） 2、表面上看來，左右兩邊沒有相同的因數(shù)，不能使用乘法分配律。我們可以通過變一變，分一分的方法找出相同因數(shù)再運用乘法分配律進(jìn)行計算 0.25×8.5×4 12.5×0.96×0.8 0.25×0.73×4 4.36×12.5×8 0.25×16.2×4 1.25×2.5×32 3.2×0.25×12.5 0.25×36 (1.25－0.125)×8 4.8×10.1 3.6×102 0.39×199 0.32×403 3.65×10.1 0.85×9.9 3.72×3.5＋6.28×3.5 15.6×2.1－15.6×1.1 4.8×7.8＋78×0.52 56.5×99＋56.5 7.09×10.8－0.8×7.09 1.87×9.9＋0.187 4.2×99＋4.2 3.8×4.56＋3.83×5.44 9.7×99＋9.7 27.5×3.7－7.5×3.7 3.14×0.68＋31.4×0.032 7.2×0.2＋2.4×1.4 5.4×11-5.4 7.74×（2.8－1.3）＋1.5×2.26 3.9×2.7＋3.9×7.3 12.7×9.9＋1.27 2.3×16+2.3×23+2.3 3.65×4.7 －36.5×0.37 101×0.87-0.91×87 46×57＋23×86 10.7×16.1-15.1×10.7 7.6×0.8＋0.2×7.6 1.28×8.6＋0.72×8.6 10.6×0.35－9.6×0.35 8.9×1.01 0.65×101 48×0.56＋44×0.48 0.279×343＋0.657×279 0.264×519＋264×0.481 9.16×1.53－0.053×91.6 0.125×96 12.5×10.8 （20－4）×0.25 45×21－50×2.1 45×1.58＋5.5×15.8 25×7.3×0.4 .