Advertisement Upgrade to remove ads

Terms found in the Everyday Math Unit 1 Lesson

Commutative Property of Addition

a + b = b + a; two numbers can be added in either order without changing the sum.

Commutative Property of Multiplication

a X b = b X a; two numbers can be multiplied in either order without changing the product.


Two or more numbers in a product. 2 X 3 = 6, the factors are 2 and 3.

factor pairs

Two factors of a number. 18 has three factor pairs: 1 and 18; 2 and 9; 3 and 6


The answer in a multiplication problem. 2 X 3 = 6, the product is 6.


The answer in a division problem. 35/ 7 = 5, the quotient is 5.


The number that divides another number in a division problem. 35/ 7 = 5; the divisor is 7.


The number in a division problem that is being divided. 35/ 7 = 5; the dividend is 35.

even number

A number (integer- ex: 2, -2) that is divisible by two.

odd number

A number (integer- ex: 3, -3) that is not divisible by two.

prime number

A whole number greater than one that has only two whole-number factors. 2, 3, 5, 7, 9, 11, 13, 15, 17, ...

composite number

A whole number greater than one that has more than two factors. 4 has the factors: 1, 4 and 2.

name-collection box

a diagram used for collecting equivalent names for a number

rectangular array

An arrangement of objects into rows and columns that form a rectangle. All rows and columns must be filled. Each row has the same number of objects. Each column has the same number of objects.

square array

A rectangular array that has an equal number of rows and columns.

number model

A number sentence or expression that models a number story or situation.
3 * 4 = 12 Three boys each had 4 marbles.

factor rainbow

A way to show factor pairs in a list of factors of a number. Can be used to check whether a list of factors is correct.

divisible by

If the larger of 2 counting numbers, divided by the smaller with no reminder, the larger is divisible by the smaller.

divisibility rule

A shortcut for determining whether a counting number is divisible by another counting number without actually doing the division.

turn-around rule for multiplication

A rule for solving addition and multiplication problems based on the Commutative Properties of Multiplication and Addition. For example: if you now that 6 8= 48, then by the turn-around rule you also know that 8 6 = 48.


An amount left over when one number is divided by another number

square number

The product of two factors that are the same.

exponential notation

a way to show repeated multiplication by the same factor


A number that stands for the power, or the number of times the base is to be multiplied.

square root

one of the two equal factors of a number

factor string

A counting number written as a product of two or more of its counting-number factors other than 1. The length of the factor string is the numbers in the string. 234 is a factor string for 24 with length 3.

prime factorization

A whole number expressed as a product of factors that are all prime numbers

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!



Reload the page to try again!


Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom


Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording