15+15= 30 20+20=40 30+20=50 70+30=100 44+55=99 6+26=33 39+14=53 36-23=13 36-25=11 27+15=42 12+28=40 52+9=61 45+18=63 52-28=34 27+5=32 sixseven 67-66=1 21-17=4 54-38=16 81-77=16

Решение:

1. \(15+15 = 30\)
2. \(20+20 = 40\)
3. \(30+20 = 50\)
4. \(70+30 = 100\)
5. \(44+55 = 99\)
6. \(6+26 = 32\)
7. \(39+14 = 53\)
8. \(36-23 = 13\)
9. \(36-25 = 11\)
10. \(27+15 = 42\)
11. \(12+28 = 40\)
12. \(52+9 = 61\)
13. \(45+18 = 63\)
14. \(52-28 = 34\)
15. \(27+5 = 32\)
16. \(67-66 = 1\)
17. \(21-17 = 4\)
18. \(54-38 = 16\)
19. \(81-77 = 16\)

Ответ: 30, 40, 50, 100, 99, 32, 53, 13, 11, 42, 40, 61, 63, 34, 32, 1, 4, 16, 16.