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
