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By: Mandy Wood
Now that you know how to add whole numbers, learning how to add decimal numbers will be a piece of cake! First, we will begin with a review of how to add one, two, and three digit numbers. Remember the rules for carrying!
Try this worksheet: Review WS
What exactly is a decimal you might ask?
A decimal is a point or period like this: .
It represents a part of a whole number.
For example, the number 2 is less than the number 2.2. “2.2” is read “two and two tenths.” The number equals two whole ones, and two tenths of a one.
Let’s go back to what we know about how numbers are categorized. Numbers are divided into ones, tens, and hundreds. They are also divided into smaller parts. Ten “tenths” equal a single “one.” One hundred “hundredths” equal a single “one.” Because numbers go on forever, there can be numbers called ten millions or ten-millionths. That is a lot of numbers!
The decimal goes here!
When do you come in contact with adding decimals? Here are some examples:
Buy It with the Little Farmer Game
Adding decimals is really no different from adding whole numbers.
First, line up the numbers vertically (up and down) as you normally do.
$ 21.04 $ 21.04
+ 6.78+ 6.78
The only thing you have to do differently is to position the decimal. Make a straight line down that connects the two decimals and the third one that will be in the sum.
Now, add as you normally would! Don’t forget to add the dollar sign at the front of the sum! Great job!
Don’t forget the dollar sign!