
1. 1 + 7 = 8
2. 9 – 5 = 4
3. 19 + 6 = 25
4. 24 – 12 = 12
5. 3 x 4 = 12
6. 8 : 4 = 2
7. + 4 = 7
= 3
O + 1 =
O = 2
= 3
8. – 4 = 2
= 6
O + = 7
O = 1
= 6
Δ – O = 8
Δ = 9
9. 5 + 4 = 9
10. 22 + 2 = 24
11. 7 + 7 = 14
12. 19 + 2 = 20
13. 10 – 1 = 9
14. 99 + 1 = 100
15. 98 + 7 = 100
16. 13 + 4 = 17
17. 98 + 8 = 106
18. 97 + 6 = 103
19. 27 – 15 = 42