| 1. | 6 - 2 = | 4 - 4 = | 6 - 1 = | 7 - 2 = | 4 - 2 = |
| 2. | 5 - 2 = | 5 - 3 = | 12 - 5 = | 13 - 5 = | 12 - 3 = |
| 3. | 10 - 1 = | 6 - 1 = | 8 - 1 = | 4 - 3 = | 3 - 1 = |
| 4. | 17 - 9 = | 9 - 1 = | 8 - 2 = | 15 - 7 = | 14 - 6 = |
| 5. | 13 - 6 = | 15 - 7 = | 9 - 5 = | 8 - 4 = | 6 - 5 = |
| 6. | 8 - 3 = | 9 - 2 = | 7 - 5 = | 18 - 9 = | 14 - 8 = |
| 7. | 1 - 1 = | 13 - 9 = | 9 - 3 = | 7 - 3 = | 3 - 2 = |
| 8. | 15 - 6 = | 18 - 9 = | 10 - 5 = | 13 - 5 = | 1 - 0 = |
| 9. | 11 - 8 = | 11 - 7 = | 3 - 2 = | 11 - 9 = | 9 - 4 = |
| 10. | 10 - 8 = | 7 - 1 = | 9 - 4 = | 10 - 8 = | 5 - 1 = |
| 11. | 9 - 5 = | 8 - 6 = | 2 - 0 = | 10 - 3 = | 9 - 8 = |
| 12. | 7 - 5 = | 10 - 6 = | 8 - 8 = | 12 - 5 = | 11 - 3 = |
| 13. | 12 - 6 = | 13 - 9 = | 11 - 3 = | 12 - 7 = | 14 - 5 = |
| 14. | 5 - 3 = | 13 - 7 = | 10 - 3 = | 15 - 9 = | 14 - 9 = |
| 15. | 2 - 1 = | 16 - 8 = | 14 - 7 = | 3 - 1 = | 16 - 9 = |
| 16. | 4 - 2 = | 13 - 4 = | 9 - 7 = | 14 - 7 = | 5 - 4 = |
| 17. | 15 - 6 = | 2 - 1 = | 12 - 7 = | 8 - 7 = | 5 - 4 = |
| 18. | 9 - 0 = | 15 - 9 = | 8 - 3 = | 12 - 3 = | 9 - 1 = |
| 19. | 11 - 2 = | 17 - 9 = | 9 - 2 = | 16 - 9 = | 17 - 8 = |
| 20. | 12 - 6 = | 11 - 4 = | 10 - 7 = | 10 - 4 = | 10 - 2 = |
answers to this test:
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