Overview

By now you should be comfortable with adding two numbers.

In this lesson, we are going to learn how to add three numbers together.

Look at the example below:

In this case, we can add 6 + 3.
6 + 3 = 9. Now, we will take our sum of 9 and join it with our last addend.

9 + 2 = 11

Therefore,

6 + 3 + 2 = 11

Let’s try a few more problems together! Use the pictures to help you solve.

In this case, we can first add 3 + 1.
3 + 1 = 4. Now, we will take our sum of 4 and join it with our last addend.

4 + 5 = 9

Therefore,

3 + 1 + 5 = 9

We can first add 4 + 5.
4 + 5 = 9. Now, we will take our sum of 9 and join it with our last addend.

9 + 7 = 16

Therefore,

4 + 5 + 7 = 16

We can first add 2 + 5.
2 + 5 = 7. Now, we will take our sum of 7 and join it with our last added.

7 + 1 = 8

Therefore,

2 + 5 + 1 = 8

We can first add 6 + 3.
6 + 3 = 9. Now, we will take our sum of 9 and join it with our last addend.

9 + 4 = 13

Therefore,

6 + 3 + 4 = 13

We can also add the numbers in any order and we will still get the same sum!

For example: We could add 6 + 4 first and then join the last addend of 3 with it.

6 + 4 = 10
10 + 3 = 13
6 + 3 + 4 = 13

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Practice Question 1

Let’s practice! Add the three numbers together to find the correct sum.

Practice Question 4

Write an addition sentence and then add the numbers on the petals to find the sum.

Practice Question 5

See Related Worksheets:
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