630÷70= 4.3﹣0.8= 3.4+1.6= 1.8÷0.3= 2.5×40= 4×700= 18×50= 4.2÷6= .
==8÷ == (小数).
÷4==15÷ = = 折.
3÷8== (填小数)
÷8﹦﹦12.5%﹦ : ﹦ (填小数)
= %= :15=0.8= 折.