### Prime numbers and prime facotrs.

What we have learned today:

1.) Square numbers (perfect squares) are the product of a whole number when it is multiplied to itself. Eg. 4= 2x2. Therefore 4 is a square number.

2.) Factors are whole numbers that divides evenly into a whole number, leaving no remainder.

Eg. Factors of 16:

1 2 4 8 16

3.) Prime numbers are whole numbers *greater than one*, that have only two factors, which is one (1) and itself.

Examples of prime numbers are 2, 3, 5, 7, 11.

PS: One (1) is NOT a prime number. Why? Because it only has one factor, which is itself.

4.) Prime factors are the least possible factors of a number; must always be a prime number. The *Prime Factorization* method is used to get the prime factors of a number. (factor tree)

Eg. 18

/\

9 2

/\ \

3 3 2 = Prime factors.

## 4 comments:

good job Hannah!! now I know what you guys did in math even im not in school today.. (:

Good job Hannah but you didn't need to make some of the words really big.

nice job hannah. but you shouldve put some pictures, but still nice job.

good job hannah, but yea there couldve been pictures .

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