12.4-3.6=8.8
12.5X8= 100
1/2+ 1/3=5/6
2.75+3.65=6.4
4.2÷0.2=2 1
9 10÷70= 13
1.2X0.8=0.96
15X300=4500
7.2÷0.09=80
9-0.9=0. 1
10÷0. 1= 100
1/5÷2/3=3/ 10
9.9÷3=3.3
0.06X0.3=0.0 18