Properties of Addition Lesson

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In this section, we will learn about the properties of addition. We begin with some basic vocabulary (addend, sum) that
goes with an addition problem. When two or more numbers are being added together, these numbers are referred to as addends;
the result of the addition problem is known as the sum.

Example 1: Identify the parts of: 2 + 6 = 8

The 2 and 6 are being added together, these parts are known as addends.

The 8 is the result of the addition, this part is known as the sum.

Next, we focus on the properties of addition. These include:

To solve this problem, we simply change the order of the addends:

1 + 3 -> 3 + 1

In each case, the result is 4.

1 + 3 = 4

3 + 1 = 4.

Changing the order of the addends (numbers being added) does not change the sum (result of the addition problem).

To solve this problem, we simply regroup or change which addends are enclosed in parentheses:

2 + (7 + 5) -> (2 + 7) + 5

In each case, the result is 14.

2 + (7 + 5) = 2 + 12 = 14

(2 + 7) + 5 = 9 + 5 = 14.

Changing the way we group the addends (numbers being added) does not change the sum (result of the addition problem).

Example 1: Identify the parts of: 2 + 6 = 8

The 2 and 6 are being added together, these parts are known as addends.

The 8 is the result of the addition, this part is known as the sum.

Next, we focus on the properties of addition. These include:

- Commutative Property of Addition
- States that addends can be put in any order and the result will be the same. Simply put, we can change the order of the numbers being added and obtain the same answer.

To solve this problem, we simply change the order of the addends:

1 + 3 -> 3 + 1

In each case, the result is 4.

1 + 3 = 4

3 + 1 = 4.

Changing the order of the addends (numbers being added) does not change the sum (result of the addition problem).

- Associative Property of Addition
- States that we can group the addition of three or more numbers in any order without changing the sum.

To solve this problem, we simply regroup or change which addends are enclosed in parentheses:

2 + (7 + 5) -> (2 + 7) + 5

In each case, the result is 14.

2 + (7 + 5) = 2 + 12 = 14

(2 + 7) + 5 = 9 + 5 = 14.

Changing the way we group the addends (numbers being added) does not change the sum (result of the addition problem).

Properties of Addition Resources:

Videos:

Khan Academy - Video
Khan Academy - Video
Virtual Nerd - Video
Text Lessons:

Cool Math - Text Lesson
Cool Math - Text Lesson
Purple Math - Text Lesson
Math is Fun - Text Lesson
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