The document explains how to use base 10 models to solve subtraction problems. It works through the problems 62 - 8 and 41 - 13 step-by-step, showing how to regroup tens into ones when necessary. The models demonstrate that regrouping does not change the total amount being subtracted, it just shows it in a different way. The document concludes by asking the reader to solve 53 - 9 and explain if regrouping is required.

1. Subtraction with Base 10 Models Created by Jamie Unverzagt

2. Tens Ones 62 - 8 Let’s start with 62 and then take away 8 .

3. Tens Ones 62 - 8 62 is 6 tens and 2 ones.

4. Tens Ones 62 - 8 Can you take away 8 ones ?

5. Tens Ones 62 - 8 How can you get more ones ?

6. Tens Ones 62 - 8 How many tens and ones do you have now? 5 12

7. Tens Ones 62 - 8 Now can you take away 8 ones ? 5 12 How many ones are left ? 4

8. Tens Ones 62 - 8 5 12 How many tens are left ? 4 5

9. Tens Ones 41 - 13 41 is 4 tens and 1 one.

10. Tens Ones 41 - 13 Can you take away 3 ones ?

11. Tens Ones 41 - 13 How can you get more ones ?

12. Tens Ones 41 - 13 How many tens do you have now? 3

13. Tens Ones 41 - 13 How many ones do you have now? 3 11 You had 1 one and you got 10 more .

14. Tens Ones 41 - 13 3 11 Do you still have 41 total? Explain. 10 20 30 31 32 33 34 35 36 37 38 39 40 41

15. Tens Ones 41 - 13 3 11 YES! When you regroup, you still have the same amount. You just show it a different way! 10 20 30 31 32 33 34 35 36 37 38 39 40 41

16. Tens Ones 41 - 13 Now can you take away 3 ones ? 3 11 How many ones are left ? 8

17. Tens Ones 41 - 13 3 11 Can you take away 1 ten ? 8

18. Tens Ones 41 - 13 3 11 How many tens are left ? 8 2

19. Tens Ones 24 - 5 1 14 Now Try This: 9 1 Excellent Job!

20. Tens Ones 30 - 12 2 10 Now Try This: 8 You’ve Got It! 1

21. Math Journal Topic: Explain how to solve 53 – 9 using pictures, numbers, and words. Will you have to regroup? Why or why not?