1. “I can find all the factors of a whole number.”
Factor Rainbows
“I can find all the factors of a whole number.”

2. What is a factor? Factoring means to take a number apart.
Factors are what you multiply together to get a number.
Example:
If our number is 10, two factors are 2 and 5 because 2 x 5 is 10.

3. What are Factor Pairs?
Factor pairs are two numbers that when multiplied together equal your target number.
For example: Factor pairs for 10 are...
1 x 10 and 2x5
There are 2 factor pairs for the number ten.

4. Finding Factors It has 4 factors!
In order to find all of the factors of a number you need to go through all of the numbers that can be multiplied together to make that number.
Our example number 10 has 4 factors...
1, 2, 5 and 10 because...
1 x 10 = 10
2 x 5 = 10
It has 4 factors!

5. Factor Rainbows A factor rainbow helps you find all of the factors.
What is a factor rainbow?
A factor rainbow helps you find all of the factors.
It is called a rainbow because all of the factor pairs connect to make a rainbow!

6. How many factor pairs are there for the number 12?
How do we do it!?!?!?
Making a factor rainbow is easy as pie!
Let’s try one:
Find all of the factors for the number 12.
We start by counting and seeing if a
number can be multiplied to equal 12.
How many factor pairs are there for the number 12? 3 1 2 3 4 6 12

7. Steps: Step One: Start with 1 and the number itself.
Step Two: Count up by ones to see if you can multiply two numbers together to get your target number.
Step Three: Stop when you can’t get anymore numbers in between.
Step Four: Connect the factor pairs!

8. How many factor pairs are there for 18?
One more time...
How many factor pairs are there for
the number 18?
How many factor pairs are there for 18? 3 1 2 3 6 9 18

9. Make factor rainbows for the following
YOU TRY!
Make factor rainbows for the following
numbers and tell how many factor pairs
each number has.