# math vocabulary

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1. are multiplied together to get a number
Example: 2 and 3 are factors of 6
Factors
2. can be divided evenly by a number
Example: 5,10,15,20 are all multiples of 5
Multiples
3. a number with more than two factors
Example: 10 has factors of 1, 2, 5, 10.
Composite number
4. a number with exactly 2 factors (the number itself and 1)
Example: 7 has factors of 1 & 7.
Prime number
5. 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.
6. 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.
7. 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).
8. a fraction where the numerator and denominator are interchanged.
• Reciprocal
• Example: the reciprocal of 3/5 is 5/3
9. a symbol or letter that can stand for a number in an expression or equation
Variable
10. the product of a number multiplied by itself
• Perfect square
• Ex: 9=3x3. 9 is a perfect square
11. a fraction in which the numerator is larger than the denominator
• Improper fraction
• Ex: 9/4
12. the sum of a whole number and a fraction
• Mixed number
• Ex: 5 1/4
13. the distance around the outside of a circle
Circumference
14. the widest distance across a circle, always passes through the center
Diameter
15. the distance from any point on the circle to the center