18÷6=
54÷9=
28÷7=
14÷2=
8×6=
81÷9=
150-80=
630+200=
1300-600=
54÷6÷3=
35÷5×3=
64÷8×5=
( )÷( )=( )(盘)……( )(个)
( )÷( )=( )(个)……( )(个)
13.3+6.7= 12= = 49×101≈
21×50= 12.5×8= 0.72÷0.8= =