01-Abacus Basic Sums Welcome to your 01-Abacus Basic Sums 1. 1 + 6 - 22. 2 + 2 - 33. 1 + 2 - 24. 3 + 5 - 75. 2 + 7 - 86. 3 + 6 - 47. 2 + 1 + 58. 3 + 5 - 69. 1 + 8 - 610. 2 + 7 - 411. 6 + 2 - 712. 4 + 5 - 113. 3 + 6 - 414. 2 + 7 - 615. 2 + 2 - 12 out of 1