Adding and Subtracting Decimals

1
Adding and Subtracting Decimals
2
Essential Question

• How do I add and subtract decimals?
• Always line up decimals
• Add and subtract like you always do
• Bring decimal straight down in your answers

3
Adding

• Examples
• 4.55 11.3

Put the first number on the top of the second
number and line up the decimals.
You can add a zero to help keep everything lined
up
When adding or subtracting you always start from
the right and work left.
4.55 11.3
0
15.85
4
6.44 16
When there is not a decimal put one behind
the number.
Line up the decimal
Add a zero to line up everything
6.44 16.
0
22.44
5
Subtracting

• Examples
• 5.34 -2.08

Put the first number on the top of the second
number and line up the decimals.
Different signs Take difference
5.34 -2.08
3.26
6
28 15.911
When there is not a decimal put one behind
the number.
Add zeros to line up everything, then subtract
7
9
9
28. -15.911
000
.
8
0
2
1
9