Subtraction with regrouping is done when the ones digit of the minuend is less than the ones digit in the subtrahend. Regrouping is done by renaming the minuend with more than 10 ones.

1. Grade 1
Subtracting Numbers with Regrouping

2. Finding the difference can be done in
two ways:
1. Long Method using the expanded
form.
35-19=____
9 ones cannot be subtracted from 5
ones. So we have to rename 30+5 as
20+(10+5), then as 20+15.

3. 35= 30+5= 20+10+5
19= 10+5= 10+ 9
10 + 1 + 5=
= 10 + 6
16=

4. 2. Short Method.
Lets try to write it vertically:
35
-19
152
61

5. Here is another example.
What is the difference of 84-67?
1. Long Method

6. 2. Short Method

7. Formative:
A. Use the long method to find the difference.
83
-28
76
-48

8. B. Use the short method to find the
difference.
73
-48
82
-57

9. Grade 1 page 174 MDLB book
Kinder 142-143 Math book
Homework:

10. Thank you!