**addition**- the process of adding two numbers to get their sum

**difference**- the difference between two numbers is what you get when you subtract one from the other

**division**- a basic arithmetical operation determining how many times one quantity is contained within another

**estimate**- a rough guess at the value of a number

**interval**- in math, the space or distance between numbers

**multiplication**- the basic arithmetic operation of repeated addition

**number line**- a line on which each point represents a real number

**place value**- within a number, each digit is given a place value depending on it's location within the number

**product**- the result of multiplying two numbers

**remainder**- the number left over when one number is divided by another

**subtraction**- a basic operation of arithmetic in which you take away one number from another

**sum**- the result of addition

**digit**- in the decimal system, one of the numbers 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

**period**- each group of three digits in a series of numbers, starting from right to left

**rounding**- the process of approximating a number to a nearby one

**comparing**- to note the similarity or dissimilarity between two numbers

**add**- combine quantities, find a total

**subtract**- find a difference, take away a quantity, "how much left", "how much is left"

**multiply**- to put together a number of equal amounts to find a total, add the same number repeatedly

**divide**- to put together a number of equal amounts to find a total, Add the same number repeatedly

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