This document provides an introduction to addition of whole numbers up to 4 digits. It reviews place value concepts and defines the term "sum" as it relates to addition. Examples are provided to demonstrate how to set up and solve multi-step addition problems by writing out place values, carrying numbers, and verifying answers through reverse calculations. Guiding questions are included to help students work through the process and check their understanding.

1. Whole Numbers
Addition
What will we learn today?
• addition of numbers up to 4 digits
• use of the terms ‘sum’

2. Before we begin, let’s recall
what is place values.

3. In the number 1245,
tens ones

4. In the number 1245,
thousands hundreds

5. So, in a 4-digit number,
There are
 Thousands place
 Hundreds place
 Tens place
 Ones place

6. Find the sum of 1369 and 5240.
a) 3871 Did you notice
b) 3889 the important information?
c) 6509
d) 6609

7. Find the sum of 1369 and 5240.
a) 3871 The word ‘sum’ refers to
b) 3889 addition of the numbers.
c) 6509
d) 6609

8. Find the sum of 1369 and 5240.
a) 3871 By using workings,
b) 3889 find the answer.
c) 6509 Counter-check your workings
with mine on the next page.
d) 6609

9. +1
1369
+ 5240
6609
Did you get the same answer?

10. Find the sum of 1369 and 5240.
a) 3871
b) 3889
c) 6509
d) 6609

11. Here’s another example.

12. 3 thousands + 7 hundreds + 5 ones =____
a) 375
b) 3075
c) 3705
d) 3750
Do you need any help?

13. 3 thousands + 7 hundreds + 5 ones =____
a) 375
b) 3075
c) 3705
d) 3750
Write down the values for all given information.

14. 3 thousands + 7 hundreds + 5 ones =____
3000 700 5
a) 375
b) 3075
c) 3705
d) 3750
Write down the values for all given information.

15. 3 thousands + 7 hundreds + 5 ones =____
3000 700 5
a) 375
b) 3075
c) 3705
d) 3750
Add the values together.

16. 3000
+ 700
_____5
3705
Did you get the same answer?

17. 3 thousands + 7 hundreds + 5 ones =____
a) 375
b) 3075
c) 3705
d) 3750

18. Here’s an example.

19. 2139 + ______ = 3507
a) 1368
b) 1432
c) 2588
d) 5646
Do you need any help?

20. 2139 + ______ = 3507
a) 1368
b) 1432
c) 2588
d) 5646
Let’s work backwards.

21. 2139 + ______ = 3507
a) 1368
b) 1432
c) 2588
d) 5646
To find the missing number,
you need to do subtraction.

22. 3507
- 2139

23. 4 1
3507
- 2139
Since the value is insufficient, we shall
borrow from the next place value.

24. 4 19
3507
- 2139

25. 4 19 1
3507
- 2139
Do a simple subtraction.

26. 4 19 1
3507
- 2139
1368
Did you get the same answer?

27. 2139 + ______ = 3507
a) 1368
b) 1432
c) 2588
d) 5646

28. Are you ready to
try out the
questions?