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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


Equality: The condition of having the same value.


Graph: A pictorial device used to show a numerical relationship.


Equation: A statement that two mathematical expressions have the same value.


Addition: The operation of adding numbers.


Addend: Any number being added.
example: 6+4=10, 6 and 4 are addends


Divisor: The number by which another number is divided.
example: 21/3, 3 is the divisor


Multiply: Combine equal groups.
example: multiply 6 groups of 4 cars to get 24 cars


Perimeter: The distance around a figure


Multiplication: The operation of repeated addition of the same number.
example: 4 x 3 has the same value as 3+3+3+3


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


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

number line

Number Line: A diagram showing numbers as points on a line.


Sum: The result of addition.
example: 6+4=10, 10 is the sum


Dividend: A number that is divided by another.
example: 21/3=7, 21 is the dividend


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


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


Minus: A name for the subtraction symbol.
example: 26-3, we can say 26 minus 3


Subtract: take away a number (or quantity) from another number (or quantity).


Add: Combine

take away

Take Away: remove something


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


Square: a parallelogram with four congruent (equal) sides and four right (90 degree) angles


Solution: any value for a variable that makes an equation true
example: the solution of 2x=24 is x=12

square unit

Square Unit: a unit, such as a square centimeter or square inch, used to measure area.


Product: the result of multiplication.
example: 5x4=20, 20 is the product


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


Quotient: the result of division.
example: 21/3=7, 7 is the quotient

mental math

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


Subtraction: the operation that gives the difference between two numbers.

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