Factor-

A number that divides evenly into another number

This might look scary at first, but don't worry! It will make sense soon. Lets start with something easy like 12. The factors of 12 are 1,2,3,4,6 and 12. Why aren't 5,7,8,9,10 or 11 factors of 12 you may ask. They are not factors of 12 because if you divide any one of them by 12, you will get a number with a decimal point. Lets try something harder, factors of 64. 2 and 32 are factors of 64 because if you multiply them together you will gt 64. Other factors of 64 are 4, 16, and 8.

Greatest Common Factor

Greatest Common Factor (G.C.F.) is the largest number that is a factor for two different numbers.

Example=80-1,80,2,40,4,20,5,16,8,10

36-1,36,2,13,3,12,4,9

In this case, the G.C.F. would be 4 because that is the highest factor that goes into both 80 and 36. A way you would use G.C.F. in real life is when simplifying fractions.

Prime numbers

Prime numbers are numbers with only 2 factors: 1 and itself. Some prime numbers are 2,3,5,7,11, and 13.

For more help with fractions, click here