1. Adding Decimal Numbers Using
The Column Method
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2. For example: 3.77 + 4.28

3. For example: 3.77 + 4.28
Firstly, line the numbers up correctly
U
3
+ 4
t
7
2
h
7
8

4. For example: 3.77 + 4.28
Firstly, line the numbers up correctly and add a decimal point in
the answer bar:
U
3
+ 4
t
7
2
h
7
8

5. U
3
+ 4
t
7
2
h
7
8
Then add up the
hundredths:

6. U
3
+ 4
t
7
2
h
7
8
Then add up the
hundredths:
7 + 8 = 15

7. U
3
+ 4
t
7
2
h
7
8
5
Then add up the
hundredths:
7 + 8 = 15
The 5 is written in the
hundredths column

8. U
3
+ 4
t
7
2
h
7
8
5
1
Then add up the
hundredths:
7 + 8 = 15
The 5 is written in the
hundredths column and
the 1 is carried into the
tenths column and
written below the
answer bar.

9. U
3
+ 4
t
7
2
Now add up the tenths:
h
7
8
5
1

10. U
3
+ 4
t
7
2
Now add up the tenths:
7 + 2 + 1 = 10 tenths
h
7
8
5
1

11. U
3
+ 4
Now add up the tenths:
7 + 2 + 1 = 10 tenths
The 0 is written in the
tenths column
t
7
2
h
7
8
0
5
1

12. U
3
+ 4
Now add up the tenths:
7 + 2 + 1 = 10 tenths
The 0 is written in the
tenths column and the 1
is carried into the
UNITS column and
written below the
answer bar.
h
7
8
0
1
t
7
2
5
1

13. U
3
+ 4
1
h
7
8
0
Finally, add up the units:
t
7
2
5
1

14. U
3
+ 4
1
h
7
8
0
Finally, add up the units:
3+4+1=8
t
7
2
5
1

15. U
3
+ 4
Finally, add up the units:
3+4+1=8
The 8 is written in the
Units column
t
7
2
h
7
8
8
0
5
1
1

16. U
3
+ 4
t
7
2
h
7
8
8
0
5
1
1

17. That’s it for now......
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