- 0 + 0: 0
- 0 + 1: 1
- 0 + 2: 2
- 0 + 3: 3
- 0 + 4: 4
- 0 + 5: 5
- 0 + 6: 6
- 0 + 7: 7
- 0 + 8: 8
- 0 + 9: 9
- 1 + 0: 1
- 1 + 1: 2
- 1 + 2: 3
- 1 + 3: 4
- 1 + 4: 5
- 1 + 5: 6
- 1 + 6: 7
- 1 + 7: 8
- 1 + 8: 9
- 1 + 9: 10
- 2 + 0: 2
- 2 + 1: 3
- 2 + 2: 4
- 2 + 3: 5
- 2 + 4: 6
- 2 + 5: 7
- 2 + 6: 8
- 2 + 7: 9
- 2 + 8: 10
- 2 + 9: 11
- 3 + 0: 3
- 3 + 1: 4
- 3 + 2: 5
- 3 + 3: 6
- 3 + 4: 7
- 3 + 5: 8
- 3 + 6: 9
- 3 + 7: 10
- 3 + 8: 11
- 3 + 9: 12
- 4 + 0: 4
- 4 + 1: 5
- 4 + 2: 6
- 4 + 3: 7
- 4 + 4: 8
- 4 + 5: 9
- 4 + 6: 10
- 4 + 7: 11
- 4 + 8: 12
- 4 + 9: 13
- 5 + 0: 5
- 5 + 1: 6
- 5 + 2: 7
- 5 + 3: 8
- 5 + 4: 9
- 5 + 5: 10
- 5 + 6: 11
- 5 + 7: 12
- 5 + 8: 13
- 5 + 9: 14
- 6 + 0: 6
- 6 + 1: 7
- 6 + 2: 8
- 6 + 3: 9
- 6 + 4: 10
- 6 + 5: 11
- 6 + 6: 12
- 6 + 7: 13
- 6 + 8: 14
- 6 + 9: 15
- 7 + 0: 7
- 7 + 1: 8
- 7 + 2: 9
- 7 + 3: 10
- 7 + 4: 11
- 7 + 5: 12
- 7 + 6: 13
- 7 + 7: 14
- 7 + 8: 15
- 7 + 9: 16
- 8 + 0: 8
- 8 + 1: 9
- 8 + 2: 10
- 8 + 3: 11
- 8 + 4: 12
- 8 + 5: 13
- 8 + 6: 14
- 8 + 7: 15
- 8 + 8: 16
- 8 + 9: 17
- 9 + 0: 9
- 9 + 1: 10
- 9 + 2: 11
- 9 + 3: 12
- 9 + 4: 13
- 9 + 5: 14
- 9 + 6: 15
- 9 + 7: 16
- 9 + 8: 17
- 9 + 9: 18