0.24:4=0.06

15.3:5=3.06

12.4:8=1.55

0.15:30=0.005

0.06+3.06=3.12

3.12+1.55=4.67

4.67+0.005=4.675

2)1.24+3.56=4.8

    4.8:16=0.3

3)3.72:12=0.31

    2.28+0.31=2.59

4) 11.7-3.7=8

      2.4:8=0.3

      3.6+0.3=3.9