732+158﹣209
342+(536﹣248)
812﹣237﹣375
54÷9=
9×7=
65÷8=
7000﹣2000=
320+500=
60+70=
2600﹣800=
4000﹣700=
31﹣12÷4=
9+2×4=
6×8﹣8=
72÷(3×3)=
56÷ 7=
30÷ 5=
54÷( )=6
81÷9=
14÷2=
( )×7=49
72÷ 8=
63÷7=
48-8=
28÷7=
9×( )=81
20+15÷5
75-38+22
42÷(43-37)
×8< 49 7×<50 <8×9
12﹣3.6= 12×0.5= 36×25%= ×6+=
+= ÷4= 0××5= 28÷1.25÷8=