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- Shelbyville High School
- Pre algebra
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- Chapter 1 Variables, Expressions and Integers

Jamie W.

Numerical expression

consists of numbers and operations

variable

a letter used to represent one or more numbers

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variable expression

consists of numbers, variable and operations

evaluate

substitute a number for each variable and evaluate the resulting numerical expression

power

the result of a repeated multiplication of the same factor

base

number used as the factor

exponent

number used to know how many times to multiply the factor

order of operations

a set of rules used to evaluate expressions; PEMDAS

parenthesis; exponents, multiplication, division, addition and subtraction

integer

all numbers positive and negative

negative integer

integers that are less than 0

positive integers

integers that are greater than 0

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absolute value

the numbers distance from 0 on a number line - always positive

opposite

numbers that have the same absolute value but different signs

additive inverse

opposite of a number

difference

the result of subtracting two numbers

mean

the sum of the vallues divided by the number of values

median

mode

the value that occurs most often

range

the difference of the greatest value and the least value

coordinate plane

formed by the intersection of the horizontal number line called the x-axis and a vertical number line called the y-axis

origin

the point where the axes meet

ordered pair

x coordinate & y-coordinate that are found in a coordinate plane

scatter plot

uses a coordinate plane to display paired data

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