2. From Grade 2 Curriculum Document There are 12 plus-two facts: 4 + 2, 5 + 2, 6 + 2, 7 + 2, 8 + 2, 9 + 2 and their commutative pairs 2 + 4, 2 + 5, 2 + 6, 2 + 7, 2 + 8, 2 + 9. (Note: 1 + 2, 2 + 2, 3 + 2, 2 + 1, and 2 + 3 have already been included in other strategies but could also be thought of as next even or odd numbers.) This strategy involves associating the addition of 2 with skip counting by 2, or with getting the next even or odd number. You could help students get ready for this strategy by conducting skip-counting chants starting at different numbers. For example, for 5 + 2, think, 5 is an odd number and the next odd number is 7; or skipping 2 starting at 5 is 7. For the subtraction of one, think the number one before 2 – 2, 3 – 2, 4 – 2, 5 – 2, 6 – 2, 7 – 2, 8 – 2, 9 – 2. As with addition, the previous odd or even number or skip counting by 2 backward starting at 7 is 5.

3. 2+9

4. 2+6

5. 5+2

6. 9+2

7. 2+4

8. 6+2

9. 2+5

10. 2+8

11. 8+2

12. 2+7

13. 7+2

14. 4-2

15. 5-2

16. 3-2

17. 6-2

18. 2-2

19. 9-2

20. 7-2

21. 8-2

22. 4+2