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Regrouping for Double-Digit Subtraction Two-Digit Subtraction – Regrouping.

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Presentation on theme: "Regrouping for Double-Digit Subtraction Two-Digit Subtraction – Regrouping."— Presentation transcript:

1 Regrouping for Double-Digit Subtraction Two-Digit Subtraction – Regrouping

2 Two approaches: Two-Digit Subtraction – Regrouping “10 First” Approach Common Approach

3 1. “10 First” Approach Two-Digit Subtraction – Regrouping 6 23 -16 23 -16

4 Start with subtracting the units column Two-Digit Subtraction – Regrouping 23 -16 23 -16 36363636

5 First, put 3 on Mathline Two-Digit Subtraction – Regrouping 23 -16 23 -16

6 Can we subtract six? Two-Digit Subtraction – Regrouping 23 -16 23 -16 6

7 6 No, 3 is less than 6 Two-Digit Subtraction – Regrouping So we need to regroup

8 23 -16 23 -16 6 10 First Approach! Two-Digit Subtraction – Regrouping

9 23 -16 23 -16 6 Start by clearing the MathLine Two-Digit Subtraction – Regrouping

10 23 -16 23 -16 6 Count 10 from right and move over Two-Digit Subtraction – Regrouping

11 23 -16 23 -16 6 This is regrouping Two-Digit Subtraction – Regrouping 11 One ten becomes ten ones

12 23 -16 23 -16 6 Now put the 3 ones back Two-Digit Subtraction – Regrouping 11

13 23 -16 23 -16 6 Now put the 3 ones back Two-Digit Subtraction – Regrouping 11 36363636

14 23 -16 23 -16 6 Two-Digit Subtraction – Regrouping 11 36363636 See 13

15 23 -16 23 -16 6 Now take 13 minus 6 Two-Digit Subtraction – Regrouping 11 36363636 123 45 6

16 23 -16 23 -16 6 See 7 Two-Digit Subtraction – Regrouping 11 36363636 7

17 Now we clear the MathLine to subtract the tens column Two-Digit Subtraction – Regrouping 23 -16 23 -16 1 7 1

18 Count ten rings on MathLine Two-Digit Subtraction – Regrouping 23 -16 23 -16 7 11 7

19 Two-Digit Subtraction – Regrouping 23 -16 23 -16 7 11 7 Then subtract 10 Count ten rings on MathLine

20 Two-Digit Subtraction – Regrouping 23 -16 23 -16 7 11 7 See zero on MathLine 0

21 2. Common Approach Two-Digit Subtraction – Regrouping 6 23 -16 23 -16

22 Start with subtracting the units column Two-Digit Subtraction – Regrouping 23 -16 23 -16 36363636

23 First, put 3 on Mathline Two-Digit Subtraction – Regrouping 23 -16 23 -16

24 Can we subtract six? Two-Digit Subtraction – Regrouping 23 -16 23 -16 6

25 6 No, 3 is less than 6 Two-Digit Subtraction – Regrouping So we need to regroup

26 23 -16 23 -16 6 Common Approach! Two-Digit Subtraction – Regrouping

27 23 -16 23 -16 Count 10 rings from the right side to regroup. Two-Digit Subtraction – Regrouping 1

28 23 -16 23 -16 Two-Digit Subtraction – Regrouping 12 Count 10 rings from the right side to regroup.

29 23 -16 23 -16 Two-Digit Subtraction – Regrouping Count 10 rings from the right side to regroup. 123

30 23 -16 23 -16 Two-Digit Subtraction – Regrouping Count 10 rings from the right side to regroup. 231 4

31 23 -16 23 -16 Two-Digit Subtraction – Regrouping Count 10 rings from the right side to regroup. 23145

32 23 -16 23 -16 Two-Digit Subtraction – Regrouping Count 10 rings from the right side to regroup. 231456

33 23 -16 23 -16 Two-Digit Subtraction – Regrouping Count 10 rings from the right side to regroup. 2314567

34 23 -16 23 -16 Two-Digit Subtraction – Regrouping Count 10 rings from the right side to regroup. 23145678

35 23 -16 23 -16 Two-Digit Subtraction – Regrouping Count 10 rings from the right side to regroup. 231456789

36 23 -16 23 -16 Two-Digit Subtraction – Regrouping Count 10 rings from the right side to regroup. 23145678910

37 23 -16 23 -16 6 Explain this ten came from the tens column 11 Two-Digit Subtraction – Regrouping Move rings to the left. This is regrouping! 23 -16 23 -16

38 Two-Digit Subtraction – Regrouping 23-16 23-16 23-16 23-16 11 Next, subtract 13 minus 6 123 45 6 1

39 Two-Digit Subtraction – Regrouping 23 -16 23 -16 11 See 7 in the ones column 7 1

40 Now we clear the MathLine to subtract the tens column Two-Digit Subtraction – Regrouping 23 -16 23 -16 1 7 1

41 Count ten rings on MathLine Two-Digit Subtraction – Regrouping 23 -16 23 -16 7 11 7

42 Two-Digit Subtraction – Regrouping 23 -16 23 -16 7 11 7 Then subtract 10 Count ten rings on MathLine

43 Two-Digit Subtraction – Regrouping 23 -16 23 -16 7 11 7 See zero on MathLine 0


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