×7<60 80>×9 2×<19
3×<24 30>9× 15> ×2
11+36+950 8268+4+10
7968+9-16 58+860-20+11
8185-29+25 72+8-272+9-1
= 90÷90%= =
= = 80×30%=
1÷1%= 4.5÷0.09=