1. You will need….  a pencil  your math journal  a hundred chart

2. What do you notice about these facts….. 10 + 4 10 + 8 6 + 10 9 + 10 5+ 10 10 + 3 7 + 10 10 + 9 3 + 10

3. You have shown that you know these facts 10 + 4 10 + 8 6 + 10 9 + 10 5+ 10 10 + 3 7 + 10 10 + 9 3 + 10

4. Do you think there is a pattern to adding ten? 10 + 4 10 + 8 6 + 10 9 + 10 5+ 10 10 + 3 7 + 10 10 + 9 3 + 10

5. Do you think that pattern works with ALL numbers? 10 + 4 10 + 8 6 + 10 9 + 10 5+ 10 10 + 3 7 + 10 10 + 9 3 + 10

6. With a partner, think of 6 different numbers that are greater than 20 but less than 100. Record those numbers in the column that says “My Number”

7. After choosing and recording 6 numbers, write your number + 10 in the next column

8. Then make a prediction of what the sum of your number plus ten will be.

9. After making all of your predictions, use a hundred chart to find the actual sum of your number plus ten.

10. We will come back together in a few moments. Be prepared to share: The sums you found If there is a pattern or rule What changed What stayed the sameThe sums you found If there is a pattern or rule What changed What stayed the same

11. What do you notice about these facts….. 14 - 10 18 - 10 16 - 10 19 - 10 15 - 10 12 - 10 17 - 10 11 + 10 13 - 10

12. You have shown that you know these facts. 14 - 10 18 - 10 16 - 10 19 - 10 15 - 10 12 - 10 17 - 10 11 + 10 13 - 10

13. Do you think there is a pattern to subtracting 10? 14 - 10 18 - 10 16 - 10 19 - 10 15 - 10 12 - 10 17 - 10 11 + 10 13 - 10

14. Do you think that pattern works with ALL numbers? 14 - 10 18 - 10 16 - 10 19 - 10 15 - 10 12 - 10 17 - 10 11 + 10 13 - 10

15. With a partner, think of 6 different numbers that are greater than 20 but less than 100. Record those numbers in the column that says “My Number”

16. After choosing and recording 6 numbers, write your number - 10 in the next column

17. Then make a prediction of what the difference of your number minus ten will be.

18. After making all of your predictions, use a hundred chart to find the actual difference of your number minus ten.

19. We will come back together in a few moments. Be prepared to share: The differences you found If there is a pattern or rule What changed What stayed the sameThe differences you found If there is a pattern or rule What changed What stayed the same

20. Now that we’ve shared our ideas… Write a rule to help you remember facts that subtract 10.Write a rule to help you remember facts that subtract 10. Remember to illustrate your rules with an example. Remember to illustrate your rules with an example.

21. If you finish early, you can play a math fact folder game.