405÷24= 18900÷210= 2840÷300=4880÷16= 1900÷200= 6936÷17=
= ÷16== ÷56= (填小数)
÷4== ÷12==3:4= %= 折.
= =25÷ = %
0.25=3÷ = :8.
=0.375= %= :24.