Question

用简便方法计算下面各题↓

12.5*2.5*3.2 5.6÷0.32 100.1*23
（不是用分数，用小数或整数）

Answer 1

12.5*2.5*3.2
=12.5x8x2.5x0.4
=100x1
=100

5.6÷0.32
=56÷（8x0.4）
=7÷0.4
＝70÷4
＝17.5

100.1x23
=(100+0.1)x23
=2300+2.3
=2302.3