7. 12/6 = 2
8. 14 + 5 = 19
9. 2 * 12 = 24
10. 20 -15 = 5 (5 + 10 = 15)
11. Thirty-six divided by nine.
12. Thirty-five minus sixteen plus eleven.
13. The first one goes with the last one. ( (25 - 10) + 8 )
The second one goes with the the third one. ( 25 - (10 + 8) )
The third one goes with the second one. (15 - 6)
The fourth one goes with the first one. ( 3 * (15 - 6)
Hope this helps, and is what you're looking for! :)