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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

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

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

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

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

8 First Approach! Two-Digit Subtraction – Regrouping

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

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

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

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

13 Now put the 3 ones back Two-Digit Subtraction – Regrouping

14 Two-Digit Subtraction – Regrouping See 13

15 Now take 13 minus 6 Two-Digit Subtraction – Regrouping

16 See 7 Two-Digit Subtraction – Regrouping

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

18 Count ten rings on MathLine Two-Digit Subtraction – Regrouping

19 Two-Digit Subtraction – Regrouping Then subtract 10 Count ten rings on MathLine

20 Two-Digit Subtraction – Regrouping See zero on MathLine 0

21 2. Common Approach Two-Digit Subtraction – Regrouping

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

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

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

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

26 Common Approach! Two-Digit Subtraction – Regrouping

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

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

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

30 Two-Digit Subtraction – Regrouping Count 10 rings from the right side to regroup

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

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

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

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

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

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

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

38 Two-Digit Subtraction – Regrouping Next, subtract 13 minus

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

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

41 Count ten rings on MathLine Two-Digit Subtraction – Regrouping

42 Two-Digit Subtraction – Regrouping Then subtract 10 Count ten rings on MathLine

43 Two-Digit Subtraction – Regrouping See zero on MathLine 0


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