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are multiplied together to get a number
Example: 2 and 3 are factors of 6
Factors

can be divided evenly by a number
Example: 5,10,15,20 are all multiples of 5
Multiples

a number with more than two factors
Example: 10 has factors of 1, 2, 5, 10.
Composite number

a number with exactly 2 factors (the number itself and 1)
Example: 7 has factors of 1 & 7.
Prime number

the highest factor that 2 numbers have in common.
Example: the factors of 6 are 1, 2, 3, and 6. The factors of 9 are 1, 3, and 9.
 Greatest Common Factor (GCF)
 GCF of 6 and 9 is 3.

the smallest multiple that 2 numbers have in common
 Least Common Multiple (LCM)
 Example: Multiples of 3 are 3, 6, 9, 12, 15.... Multiples of 4 are 4, 8, 12, 16.... The LCM of 3 and 4 is 12.

a number, written as a product of its prime factors.
 Prime Factorization
 Example: 140 can be written as 2 x 2 x 5 x 7. (All of these are prime factors of 140).

a fraction where the numerator and denominator are interchanged.
 Reciprocal
 Example: the reciprocal of 3/5 is 5/3

a symbol or letter that can stand for a number in an expression or equation
Variable

the product of a number multiplied by itself
 Perfect square
 Ex: 9=3x3. 9 is a perfect square

a fraction in which the numerator is larger than the denominator

the sum of a whole number and a fraction

the distance around the outside of a circle
Circumference

the widest distance across a circle, always passes through the center
Diameter

the distance from any point on the circle to the center
Radius

