| Vocabulary | Definition |
| common denominator | any nonzero number that is a multiple of the denominators of two or more fractions ( ex: the fractions 1/2 and 2/3 have common denominators 6,12,18,and so on . |
| common factor | a number that is a factor of two or more given numbers. |
| denominator | the bottom number in a fraction which tells the number of pieces making up a whole |
| factor tree | a diagram used to show the prime factors of a number |
| fraction | a number showing part of a whole |
| numerator | the top number in a fraction which tells the number of parts selected |
| simplify | to reduce a fraction to lowest terms |
| vertical | a line that is perpendicular to the horizon |
