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common factor

is a number that is a factor of two or more numbers.

greatest common factor or GCF

the greatest of the common factors of two or more numbers


when a number , like 3, has exactly two factors.


when a number, like 4, has more than two factors, .

prime factorization

when you can write every composite number as a product of prime numbers.

Equivalent fractions

fractions that have the same value.

simplest form

when the GCF of the numerator and denominator is 1.


is the product of the number and any whole number.

common multiple

a whole number that is a multiple of two or more whole numbers.

least common multiple (LCM)

is the least multiple, other than 0 , common to sets of multiples.

common denominator

of two or more fractions is a number that is a multiple of the denominators of the fractions.

least common denominator

the least common multiple of the denominators , to compare fractions.

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