Adding Decimals


Adding decimals is just like adding other whole numbers except we have to line up the addends and the decimal points.

For example:

2.5
+3.2
5.7

Here’s another example adding 5.61 and 5.7

5.61
+5.70
11.31

In the above example, we lined up the numbers and the decimal points. Next, we added a zero to 5.7 to make it 5.70. We also had to carry or rename the numbers when we added 6 and 7 together…we then put the 3 below the 6 and 7 and carried the 1 to the left and added it to 5 plus 5. Nothing else needed to be done…easy or what?

Here’s another example adding 23.8 and 7.615…

23.800
+07.615
31.415

Notice we added zeros as place holders to the right and to the left of the numbers above. For 23.8 we added two zeros so the decimal points would line up with the second addend. The second addend, 7.615 had a zero added to the tens column to make it line up with the 2 in the first addend 23.8 so we ended up adding 23.800 to 07.615…Are you getting the hang of this? Let’s see!

Add the following decimals:

1.5
+2.7
7.60
+4.52
Â
01.722
+13.600
213.08
+009.12
Â

Page 3 of Decimals