8×9=
1200-800=
6×6=
8800-800=
6÷1=
9÷4=
6000+20=
100+900=
3个百+5个十= 4×5+3= 8-8÷2=
550-90=
350-190=
190+240=
510+80=
900-780=
60+28=
420-160=
72÷8=
36÷9=
56÷8=
72-8=
48÷6=
(34-4)÷5=
49÷7=
81÷9=
5×6+5=
7×8-4=
(49+5)÷6=