Download presentation

Presentation is loading. Please wait.

Published byKya Ellers Modified over 2 years ago

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

Similar presentations

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google