Addition: 1. 2 + 5 = 7 2. 6 + 3 = 9 3. 1 + 2 = 3 4. 8 + 1 = 9 5. 5 + 3 = 8 6. 4 + 2 = 6 7. 7 + 0 = 7 8. 1 + 7 = 8 9. 9 + 0 = 9 10. 4 + 3 = 7

Subtraction: 1. 10 - 3 = 7 2. 8 - 5 = 3 3. 7 - 6 = 1 4. 5 - 4 = 1 5. 10 - 6 = 4 6. 6 - 2 = 4 7. 2 - 0 = 2 8. 3 - 2 = 1 9. 8 - 7 = 1 10. 10 - 9 = 1