The document provides an introduction to adding numbers without regrouping, explaining the concept of addition as combining sets to form a new set. It outlines the steps for adding two-digit and three-digit numbers, emphasizing the process of adding ones, tens, and hundreds. Examples are given for practice to reinforce the addition skills taught.

1. Mathematics
2

2. Adding
Without
Regrouping

3. What is adding
numbers?

4. Adding numbers is
putting together two sets
of things or people to
form a new set.

5. girls
in a
class
boys
in a
class
and =
a class of
boys and girls

6. girls
in a
class
boys
in a
class
and =
a class of
boys and girls
The set of boys and the set of girls form a new
set that is composed of all pupils in the class.

7. We use the plus sign
(+) to put together two or
more numbers.

11. Steps in adding two-digit
numbers without regrouping:
1.Add the ones.
2.Add the tens.

12. Example:
34 + 23 = _____
34
+23

13. 34
+23

14. 34
+23
7

15. 34
+23
57

16. Example:
21
18
+10

17. Example:
21
18
+10

18. Example:
21
18
+10
49

19. Try This!!!

20. 12
15
+11

21. 12
15
+11
38

22. 56
+43

23. 56
+43
99

25. 234
+125

26. Steps in adding three-digit
numbers without regrouping:
1.Add the ones.
2.Add the tens.
3.Add the hundreds.

27. 234
+125

28. 234
+125
9

29. 234
+125
59

30. 234
+125
359

31. Try This!!!

32. 236
+542

33. 236
+542
778

34. 345
+444

35. 345
+444
789

36. Mathematics
2