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math vocabulary and definitions

### rational number

Rational Number: A number that can be expressed as a ratio in fraction form.

examples: 1, -2, 1/4, -0.25

### multiplication

Multiplication: The operation of repeated addition of the same number.

example: 4 x 3 has the same value as 3+3+3+3

### operation

Operation: addition, subtraction, multiplication, division, and raising a number to a power are some mathematical operations.

### expression

Expression: A variable or combination of variables, numbers, and opertion symbols that represents a mathematical relationship.

example y-3

### > (is greater than)

> (is greater than) The number or expression to the left of the symbol has greater value than the number or expression tot he right of the symbol.

example: 700>600

### = (is equal to)

= (is equal to): The number or expression to the left of the symbol has the same value as the number or expression tot he right of the symbol.

example: 383=383

### area

Area: the measure, in square units, of the interior region of a 2-dimensional figure or the surface of a 3-dimensional figure.

### opposites

Opposites: Numbers that are the same distance from zero in different directions on a number line.

example: 2 and -2 are opposites

### order of operations

Order of Operations: Rules describing what sequence to use in evaluating expressions. Parentheses, exponents, multiply or divide left to right, add or subtract left to right.

### < (is less than)

< (is less than): The number or expression to the left of the symbol has less value than the number or expressison to the right of the symbol.

example: 110<120

### divide

Divide: separate into equal groups and find the number in each group or the number of groups.

### solution

Solution: any value for a variable that makes an equation true

example: the solution of 2x=24 is x=12

### division

Division: the operation of making equal groups and findign the number in each group or the number of groups.

### mental math

Mental Math: a way to calculate an exact answer without using paper and pencil or other physical aids.