1. Вставь числа в «окошки».

Решение:

1. \( 74 + 10 + \boxed{7} = 91 \)
2. \( 37 + 40 + \boxed{8} = 85 \)
3. \( 69 + 20 + \boxed{9} = 98 \)
4. \( 26 + 50 + \boxed{7} = 83 \)
5. \( 47 + 40 + \boxed{5} = 92 \)
6. \( 58 + 30 + \boxed{3} = 91 \)
7. \( 15 + 40 + \boxed{9} = 64 \)
8. \( 46 + 20 + \boxed{6} = 72 \)
9. \( 57 + 30 + \boxed{8} = 95 \)
10. \( 28 + 40 + \boxed{8} = 76 \)
11. \( 45 + 10 + \boxed{6} = 61 \)
12. \( 66 + 20 + \boxed{7} = 93 \)
13. \( 39 + 10 + \boxed{8} = 57 \)
14. \( 17 + 50 + \boxed{8} = 75 \)
15. \( 48 + 30 + \boxed{6} = 84 \)
16. \( 57 + 20 + \boxed{5} = 82 \)

Ответ: 7, 8, 9, 7, 5, 3, 9, 6, 8, 8, 6, 7, 8, 8, 6, 5.