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