小学数学小数乘法简便运算类型题总复习
-
简介
1.拆加型 3.5×10.2 =3.5×(10+0.2) =3.5×10+3.5×0.2 =35+0.7 =35.7 2.拆减型 3.5×9.8 =3.5×(10−0.2) =3.5×10−3.5×0.2 =35−0.7 =34.3 3.顺展型 2.5×(4+0.8) =2.5×4+2.5×0.8 =10+2 =12 4.逆合型 8.5×4.3+5.7×8.5 =8.5×(4.3+5.7) =8.5×10 =85 5.添“1”型 2.5×3+2.5 =2.5×3+2.5×1 =2.5×(3+1) =2.5×4 =10 6.拆倍法 2.5×97+7.5 =2.5×97+2.5×3 =2.5×(97+3) =2.5×100 =250
本年级热门下载
同类热门下载