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acute triangle

triangle with all angles less than 90 degrees

algebraic expression

numbers, symbols, and variables

area

space inside a 2D figure

bar graph

uses bars to compare data

base

the bottom of a figure

circumference

distance around a circle

congruent

same size and shape

cubed

the third power (exponent of 3)

denominator

bottom of fraction

diameter

distance across a circle

dilation

a larger or smaller version of a figure

equation

a math sentence with an = sign

equilateral triangle

triangle where all sides are equal length

equivalent fractions

two equal fractions

experimental probability

chances based on results of experiment

exponent

tells how many times to multiply a number

expression

collection of numbers, symbols, and/or variables

factor

a number that can be multiplied to make another number

frequency table

uses tallys to record how often something occurs

GCF

greatest common factor

histogram

uses bars to compare intervals of numbers

inequality

one expression in greater than or less than another

integers

positive whole numbers and opposites

isosceles triangle

two sides are the same

LCM

least common multiple - least common number that two numbers are factors of

line graph

best type of graph for changes over time

line plot

uses x's to show how often a data item occurs

mean

the average of a group of numbers - add numbers and divide by how many numbers

median

the middle number in a set of numbers

mode

the most common in a set of numbers

numerator

the top of a fraction

obtuse triangle

a triangle with one angle larger than 90 degrees

order of operations

parenthesis, exponents, multiply and divide, add and subtract

outlier

a value that is much greater or much less than the rest of the numbers

parallel

never intersect

perpendicular

intersect and form a right angle

parallelogram

quadrilateral with 2 pairs of parallel sides

percent

a ratio out of 100

perimeter

the distance around a polygon

plane

a flat surface

polygon

closed figure made of at least 3 line segments

prime factorization

writing composite numbers and product of primes

prime number

number that has only 2 factors (1 and itself)

probability

measuring how likely something is to occur

proportion

2 equal ratios

quadrilateral

having 4 sides

quotient

the answer to a division problem

radius

halfway across circle; from center to edge of circle

range

highest value minus lowest value

ratio

comparing 2 numbers by division

reflection

a mirror image of a figure

right triangle

triangle with a right angle

rotation

turning a figure around a point

rule

a procedure for creating a pattern in a series of numbers

scalene triangle

all sides different length in a triangle

sector

a part of a circle

similar figures

same shape, but a larger or smaller version; sides form a proportion

squared

number to the second power (times itself)

surface area

area of the outside of a 3D figure

theoretical probability

what should happen based on possible outcomes

translation

moving (or sliding) a figure along a straight path

trial

performing an experiment

variable

letter used to represent an unknown quantity

volume

space inside a 3D figure

vertex

corner of a 2D or 3D figure where 2 lines meet