1. Add 2-digit numbers with regrouping

2. Add 2-digit numbers with regrouping 1- 4 3 1 60 1 81 1 91 1 93 1 01

3. Add 2-digit numbers with regrouping 5 - 8 7 1 04 1 62 1 92 1 32 1 91

4. Add 2-digit numbers with regrouping 9 - 12 4 1 04 1 92 1 02 1 02 1 9111

5. Add 2-digit numbers with regrouping 13 - 16 5 1 84 1 11 1 04 1 94 1 711

6. Add 2-digit numbers with regrouping 17 - 20 3 1 90 1 2 1 71 1 81 1 68

7. Add 2-digit numbers with regrouping 21 - 24 2 1 51 1 1 1 71 1 01 1 9811

8. Add 2-digit numbers with regrouping 25 - 28 2 1 32 1 2 1 31 1 32 1 53

9. Add 2-digit numbers with regrouping 29 - 32 1 1 61 1 1 1 01 1 26 1 58111

10. Add 2-digit numbers with regrouping 33 - 36 2 1 32 1 2 1 2 1 62 1 745

11. Add 2-digit numbers with regrouping 37 – 40 1 1 61 1 1 1 2 1 23 1 98011

12. The end of this set.