Acute Angle
An angle that has a measure
less than a right angle
Addend
Any of the numbers
that are added
Angle
A figure formed by two rays
that meet at a common end
point
Area
The number of
square units
needed to cover a
flat surface
Array
An arrangement of
objects in rows and
columns
Average
One way to find a
number that best
represents all the
numbers in a set
Bar Graph
A way to show
information that
uses bars to stand
for data
Benchmark
A number used as
a point of reference
Calendar
A table that shows
the days, weeks,
and months of a
year in order
Capacity
The amount a
container can hold
when filled
Cardinal
A number that tells
how many
Centimeter (cm)
A unit of length in
the metric system
Certain
An event that will
always happen
Circle graph
A graph in the shape, circle
that shows data as a whole
up of different parts
Closed figure
A shape that
begins ends at the
same point
Congruent Figures
Figures that have
the same size and
shape
Cumulative
Frequency
The sum of the frequency of
data as they are collected
Cup (c)
A customary unit for
measuring capacity
Decimal
A number that uses place
value and a decimal point to
show values less than one,
such as tenths and
hundredths
Decimal point
A period used in decimal
numbers to separate the
whole number part from the
decimal part
Decimeter (dm)
A unit of length in
the metric system
Denominator
The number below the bar in
a fraction. It tells the total
number of equal parts
Difference
An answer to a
subtraction
Dimension
A measure in one
direction
Dividend
The number that is
being divided in a
division problem
Divisor
The number that
divides the dividend
Equation
A number sentence with an
equals sign to show that two
amounts are equal
Factor
A number that is
multiplied by
another number to
find a product
Foot (ft)
A unit of length in
the customary
system
Interval
The distance
between two
numbers on the
scale of a graph
Inverse
Opposite operations, such as
multiplication and division,
that and each other
Line
A straight path in a
plane, extend in
both directions with
no endpoints
Line graph
A graph that uses a
line to show how
data change over a
period time
Line plot
A diagram that shows the
frequency of data as they are
collect
Line segment
A part of a line
between two
endpoints
Line symmetry
A figure has line symmetry
when it can be folded about a
line so that its two parts are
identical
Liter (L)
A metric unit of
capacity
Mass
The amount of
matter of an object
Mean
One way to find a
number that best
represents all the
numbers in a set
Median
The middle number
in an ordered series
of numbers
Mode
The number that is
listed the most
often in a set of
data
Multiple
A number that is
the product of a
given number and
another whole
Net
A two-dimensional
pattern of a threedimensional figure
Nominal
A number that
names something
Numerator
The number above the bar in
a fraction. It tells how many
parts are being considered
Obtuse angle
An angle that has a
measure greater
than a right angle
Ordinal
A number that tells
position or order
Outcomes
Possible results of
an experiment
Pint (pt)
A customary unit for
measuring capacity
Plane
A flat surface that
extends will end in
all directions
Pint
The name of a
location on an
object and in space
Predict
To tell what will
happen when doing
experiments
Probability
The chance that a
given event will
occur
Product
The answer to a
multiplication
problem
Range
The difference between the
greatest and least numbers in
a set of data
Scale
A series of numbers placed at
fixed distances on a graph to
help label the graph
Square unit
The unit used to
measure area
Standard Form
A way to write
numbers by using
digits
Sum
The answer to an
addition problem
Survey
A collection of data
that lists choices
Tally table
A way to organize data that
uses tally marks to show how
often something
Happens
Volume
The measure of the
space a solid figure
occupies
Axis
Either of two lines drawn
perpendicular to each
other in a graph.
Center
The point from which all
points in a circle are
equally distant
Chord
A line segment
that connects two
points the circle
Common
Denominator
A number that is the
denominator of two or
more fractions
Common Factor
A number that is a factor
of or more given numbers
Compatible
numbers
Numbers which are to
compute with mentally
Compensation
Adjusting one number of
an operation to make
computations easier and
balancing the adjustment
by changing the of number
Composite
number
A whole number great
than one that has more
than two factors
Equal ratios
Ratios that show
the same
comparison
Formula
An equation that
states a rule
Greatest Common Factor
(GCF)
The greatest number
that is a factor
of two or
more numbers
Negative Integers
Integers that are
less than zero
Opposites
Numbers that are
the same distance
away from zero
Origin
The point where the two axes
of the coordinate plane
intersect. The origin is
represented by the ordered
pair
Outcome
A result in an
experiment
Overestimate
The result of using larger
numbers to estimate a sum or
product. The estimate is
larger than the actual answer