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# Math Vocab Unit 1

### Vocabulary Terms for Unit 1

TermDefinition
array A grouping with rows and columns. Each row and column has the same number of objects. **** **** ****
number model A number sentence that models a number story . Example: 3 x 4 = 12
commutative property of multiplication Two numbers can be multiplied in either order without changing the product (answer). Example: 3 x 4 = 12 4 x 3 = 12
factor The smaller numbers multiplied together to get the product (answer) 4 and 3 are the factors of 3 x 4 =12
product The answer when you multiply two numbers together. 12 is the product of 3 x 4 = 12
factor pair Any two numbers that can be multiplied together to get a product. 3 and 4 are a factor pair of 12. So are 6 and 2.
even number A counting number that is divisible by 2 2,4,6,8,10,…..
odd number A counting number that is NOT divisible by 2 1,3,5,7,9,11….
divisible by If a larger number can be divided by a smaller number with no remainder. Ex. 12 / 4 = 3. 12 is divisible by 4. 13 / 4 = 3 r1, so 13 is NOT divisible by 4.
remainder The amount left over when one number is divided by another. 13 / 4 = 3 r 1. R = the remainder.
factor rainbow A way to show factor pairs in a list of factors of a number
quotient The result of dividing one number by another. 12 / 6 = 2. 2 is the quotient.
prime number A counting number greater than 1 that can only be multiplied by 1 and itself. 2,3,5,7,11 are all prime numbers.
composite number A counting number greater than 1 that has more than two factors. 8 is composite because it has factors of 1,8,2, and 4.
square number Numbers that are the product of counting number and itself. 5 x 5 = 25. Can be shown with an exponent 25 = 52
exponential notation A way to show repeated multiplication by the same factor. 23 = 2 x 2 x 2 = 8 3 is the exponent (or power).
exponent A small, raised number used to tell how many times the base number is used as a factor. 23 = 2 x 2 x 2 = 8 2 is the base number 3 is the exponent
square root The smaller number that when multiplied by itself equals a square number. The square root of 25 is 5. (5 x 5 = 25)
factor string A counting number written as the product of 2 or more factors other than 1. 2 x 3 x 4 = 24 There are 3 factors in this factor string.
prime factorization A counting number written as a product of prime number factors. 24 = 2 x 2 x 2 x 3
Created by: Mrs. Turk