40的8倍是 ;5个900是 ;6个500的和的末尾有 个0,是 .
= ÷5=0.8=4: = %= 折.
÷8=0.25= %= :16.
==8÷ == (小数).
÷4==15÷ = = 折.
3÷8== (填小数)