1. 15.3-1.12 =
2. 16.21:1.23 =
3. 18.5 -1.51 =
4. 15.4 : 1.31
5. 18.6-2.31 =
6. 13.1:2.13 =
7. 15.41:2.53 =
8. 17.24 -3.04 =
9. 25.02 : 3.22 =
10. 27.43 -3.54 =​