## Prime Factors

In art class, Mrs. Thatcher wanted the students to draw trees. Some trees looked like clouds with a trunk, but Shantea wanted to draw a tree in the winter. She drew the trunk and then added straight lines connected to each other to look like branches.

Later that day, in math, the students learned to factor numbers. 'Hey,' Shantea said, 'It looks like my tree with Mrs. Thatcher!' And they did!

A **prime number** is a whole number larger than 1 that can only be divided by 1 and itself. An example of this would be the number 7. You can't divide anything into 7, except 7 and 1.

A **factor** is any number you can multiply by another number to get a third number. In the equation 4 x 5 = 20, both 4 and 5 are factors of 20.

Bet you can guess what is coming next. A **prime factor** is a factor that is also a prime number. All whole numbers can be factored into prime numbers.

These are all the prime factors under 100:

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89 and 97.