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# Math Unit 1

### Number Theory Vocabulary Words

Composite Number A counting number greater than one that has more than two factors. For example, 4 is a composite number because it has three factors: 1, 2, and 4.
Divisible by If the larger of two counting numbers can be divided by the smaller with no remainder, then the larger is divisible by the smaller. For example, 28 is divisible by 7 because 28/7 = 4 with no remainder.
Exponent A small raised number used in exponential notation to tell how many times the base is used as a factor. Example: 52 exponent 52 = 5 * 5 = 25 103 exponent 103 = 10 * 10 * 10 = 1,000
Factor One of two or more numbers that are multiplied to give a product. 3 * 5 = 15 15 * 1 = 15 Factors Product Factors Product
Factor Rainbow A way to show factor pairs in a list of all the factors of a number. A factor rainbow can tie used to check whether a list of factors is correct.Factor rainbow for 16: 1 2 4 8 16
Number Model A number sentence expression that models a number story or situation. For example, a number model for the array shown below is 4 * 3 = 12
Prime Factorization A whole number that has exactly two factors: itself and 1. For example, 5 is a prime number because its only factors are 5 and 1.
Prime Number A whole number that has exactly two factors: itself and 1. For example, 5 is a prime number because its only factors are 5 and 1.
Product The result of multiplying two or more numbers, called factors. For example, in 4 * 3 = 12, the product is 12.
Rectangular Array An arrangement of objects in rows and columns that form a rectangle. All rows have the same number of objects, and all columns have the same number of objects.
Square number A number that is the product of a counting number multiplied by itself. For example 25 is a square number, because 25 = 5 * 5.
Created by: mrsthompson