Addition - A mathematical operation that represents combining objects t into a larger collection. It is signified by the plus sign (+). Subtraction - A mathematical operation that represents process of finding the difference between numbers or quantities. It is signified by the minus sign (-).

1. Addition
Objectives
Standard 3

2. To regroup means to rearrange groups in place
value to carry out a “working” or operation
(+ - x ÷).
We use regrouping in subtraction, when digits in
the minuend are smaller than the digits in the
same place in the subtrahend.
Regrouping

3. Regrouping
Example of Regrouping
There are 3 tens blocks and 13 ones blocks, so
10 ones need to be regrouped as 1 ten
43 43

4. Regrouping
Try on a file page. To be corrected by teacher.
There are 4 tens blocks and 17 ones blocks.
There are 7 tens blocks and 23 ones blocks.
There are 2 flat blocks, 10 rod blocks and 15
ones blocks.

5. Addition
Here are example : 2-digit to a 2-digit numeral.
No Regrouping

6. Addition
Here are example : 3-digit to a 3-digit numeral.
No Regrouping

7. Addition
Here are example : 4-digit to a 4-digit numeral.
No Regrouping

8. Addition
Here are example : 2-digit to a 2-digit numeral.
Regrouping

9. Addition
Here are example : 3-digit to a 3-digit numeral.
Regrouping

10. Addition
Here are example : 4-digit to a 4-digit numeral.
Regrouping

11. Now you can do your practice.

12. Subtraction
Objectives
Standard 3

13. To regroup means to rearrange groups in place
value to carry out a “working” or operation
(+ - x ÷).
We use regrouping in subtraction, when digits in
the minuend are smaller than the digits in the
same place in the subtrahend.
Regrouping
Revision

14. Subtraction
Here are example : 2-digit to a 2-digit numeral.
No Regrouping

15. Subtraction
Here are example : 3-digit to a 3-digit numeral.
No Regrouping

16. Subtraction
Here are example : 3-digit to a 3-digit numeral.
No Regrouping

17. Subtraction
Here are example : 3-digit to a 3-digit numeral.
No Regrouping
THE ANSWER IS: 427 – 182 = 245.

18. Subtraction
Here are example : 4-digit to a 4-digit numeral.
No Regrouping

19. Subtraction
Sample examples.
No Regrouping

20. Now you can do your practice.