What is Addition?

Addition puts values together. It's about bringing things from one area and combining them with another. It could be as simple as adding two (2) books to a stack of four (4) books. You wind up with a stack of six (6) books. It could also be as complex as assigning the masses of planets to determine the forces of gravity at different points in the solar system.

Terms that tell you addition is happening:
Put them together.
Add them up.
Combine them.
Group them.
This plus that.
This and that.

Setting up the Problem

Addition uses the "+" sign. It's called a plus sign. It tells you to add the value before the sign to the value after the sign. The two values in an addition problem are called "addends" and the answer is called the "sum." You will also see two different layouts of addition problems. There might be a horizontal layout where all of the addends are in a row. We use that horizontal style on these pages because they are easier to type. The other format is a vertical or stacked layout. This places the addends on top of each other. When you start adding larger numbers (or more than two numbers), the stacked layout will make your life easier.

Adding Single-Digit Numbers

So now you actually have to add values. In the numbers sections you learned to count. You learned that each number represents a value. "1" represents a single object. "2" represents two objects. Addition is the next step in working with those numbers. Now you need to combine the values.

1 + 1 = 2 (One object combined with one object gives you two objects.)

That's about it. If you start with one-digit numbers, you can use your fingers to do the counting. We have a bunch of activities to help you practice.

RELATED ACTIVITIES

Single-Digit Addtion Quiz (Horizontal)
- Play Activity

Single-Digit Addition Quiz (Vertical)
- Play Activity

-	Overview
-	Shapes-Colors
-	Numbers
-	Addition
>>	1 to 10
--	Carrying
--	2-Digit Numbers
--	3-Digit Numbers
--	Multiple Addends
-	Subtraction
-	Multiplication
-	Division
-	Operations
-	Dates & Times
-	Activities

-	Glossary
-	Standards
-	Site Map
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