6th - 8th grade Math Terms
Term
acute angle
acute triangle
additive inverse
adjacent angles
algebraic expression
altitude
6 7 8
Definition
Any
angle
that
measures
less than 90 degrees.
S S
Any triangle in which all angles measure less than 90
degrees.
S S
One of a pair of numbers whose sum is zero, also
S S known as its' opposite
S Angles that share a common side or ray.
A sentence that contains a variable, a number and at
S S S least one operation.
S The height of a shape.
area
To break down a concept or idea into parts and show
S S relationships among the parts
Two rays that intersect at a common endpoint.
S
The number of square units required to cover a given
S S S surface.
arithmetic sequence
ascending
An ordered list of numbers in which the difference
S S S between consecutive terms is always the same
S S moving upward
analyze
angle
associative property
axis (axes)
B
bar graph
bar notation
base (of a solid figure)
base (of a 2-d figure)
base (of a power)
biased sample
When three or more numbers are added or
mulipltied, changing the way the numbers are
grouped does not change the answer (sum or
S S S product.)
The horizontal or vertical number line used in a
S S S graph or coordinate plane.
The variable within the volume formula that stands
S S for the area of the base
A method of displaying data using horizontal or
S S S vertical bars.
S S Used to identify a repeating decimal.
Special face of a solid figure if the solid is a cylinder
or a prism , there are 2 bases that are parallel and
S S congruent.
line that is perpendicular to the height (forms the
right angle)
S
The number that is used as a factor in exponential
S S S form
S A set of data that favors one viewpoint.
S A type of graph that arranges data into even fourths.
box and whisker plot
capacity
S
S= Students should be using
T= Only teacher should be using
The amount that can be contained within an object.
Allen ISD
Revised June 2011
6th - 8th grade Math Terms
Term
circle
6 7 8
Definition
Occupying
a
middle
position.
S S S
The prefix meaning 1/100.
S S
The set of points that are the same distance from a
S S S given point called the center.
circle graph
circumference
cluster
coefficient
commision
S S S
S S S
S
S S S
S
A type of graph used to compare parts of a whole
(percentages).
The distance around a circle (perimeter).
A set of data that is grouped closely together
The number multiplied by a variable.
Money earned as a percent of sales.
common denominator
S S
A whole number that is the denominator for all
members of a group of fractions.
common difference
common factor
The difference between any 2 consecutive terms in
S S an arithmetic sequence.
A number that is a factor of 2 or more numbers.
S
center
centi-
commutative property
compatible number
complement
The order in which two or more numbers are added
or multiplied does not affect the answer (sum or
S S S product.)
Numbers that are close to the given numbers that
are easy to work with mentally
S S
The chances of something not happening.
S
complementary angles
composite event
composite figure
composite number
cone
congruent
consecutive
constant
constant of variation
S
S
S
S
S
o
S S 2 angles that have measures with a sum of 90 .
S S A combination of simple events.
An irregular figure that can be composed of 2
S S or more recognizable figures.
A number that has more than 2 factors.
S S A 3-d shape with a circular base and 1 vertex.
S S Having exactly the same size and shape.
S S In order with none missing.
s S a quantity that always stays the same.
The constant factor by which a proportion
S increases or decreases.
The ratio of change in one quantity to the
S corresponding change in another quantity.
Surveying people in a convenient way as
S opposed to a random sample.
constant rate of change
convenience sample
coordinate plane
A plane containing two perpendiular axes(x and y,
S S S intersecting at a point called the origin (0,0).
S= Students should be using
T= Only teacher should be using
Allen ISD
Revised June 2011
6th - 8th grade Math Terms
Term
coordinates
corresponding angles
corresponding sides
cube (3D Figure)
Cube (third power)
cup
customary system
cylinder
data
decagon
decidecimal number
decimal point
decreasing
degrees
dekadenominator
6 7 8
S
Definition
An ordered pair of numbers that identify a point on a
coordinate plane.
Angles in the same relative position from one figure
S S S to the other.
Sides in the same relative position from one figure to
S S S the other.
A 3-d figure in which all faces are squares.
S S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S S
S S
S
S S S
dependent event
descending
S
S S
diameter
difference
S S S
S S S
digit
S
dilation
S
dimensional analysis
dimensions
S
S S
direct variation
discount
S
S S
S= Students should be using
T= Only teacher should be using
A number raised to the third power; 23 = 2 x 2 x 2
A measure of volume
A system of measurement used in the US A 3-d figure composed of 2 circular bases.
given information, a set of numbers
10-sided polygon
prefix meaning 1/10
number that includes a decimal
point separating whole numbers and parts of a
number
getting smaller; going down in value
unit of measure for angles
prefix meaning times 10
bottom number in a fraction
event in probability that is affected by another
event
getting smaller; going down in value
the distance across a circle, measured by line
segment going through the center
The answer to a subtraction problem
symbol used to represent a number, examples
(
0,
1,
2,
3…)
proportional enlargement or reduction of a
figure (uses scale factor)
a method of converting between units of
measure
refers to length, width, height
proportional relationship between two
variables, S and y, with a constant rate of
change
amount an original price is reduced
Allen ISD
Revised June 2011
6th - 8th grade Math Terms
Term
6 7 8
Definition
product of a number and the sum/difference of
two numbers is equal to the sum/difference of
the two products, a(b+c) = ab+ac.
distributive property
dividend
S S
divisible
S
the number that is divided
when one number divides into another number
without remainders
divisor
S S
the number that divides into another
number(dividend)
domain
double
S The set of all x-coordinates from each pair.
times two
S S
graph that has two bars to compare different
data on the same graph
S
graph that has two lines to compare different
data on the same graph
S
double-bar graph
double-line graph
edge
equally likely
equation
equilateral triangle
equivalent fractions
equivalent ratios
estimate
evaluate
experiment
experimental probability
exponent
exponential form
expression
face
factor
factor tree
S
S S S line that connects two vertices in a 3D figure
chances that two events will happen are the
same
S
S S S A statement that two expressions are equal.
triangle with 3 equal sides
S S
two or more fractions that are equal
S S
two ratios that are equal
S S
To find a number close to an exact amount
S
S S S to find the value of a numerical algebraic expression
a situation involving chance or probability that leads
to results called outcomes
S S
the probability of an event occuring based on actual
S S S trials
The number that tells how many times the base is
S S S used as a factor
Way of writing a number using a base and an
S S S exponent
numerical statement including numbers,
S variables, and symbols
S S S one side of a solid figure
integer that divides evenly into another
S S S number
diagram used to identify the prime factors of a
S S S composite number
S= Students should be using
T= Only teacher should be using
Allen ISD
Revised June 2011
6th - 8th grade Math Terms
Term
fair
foot
formula
fraction
6
S
S
S
S
frequency table
front view
S S S
S S
function
S S S
fundamental counting principle
gallon
gram
graph
greater than
greater than or equal to
greatest common factor
S
S
S
S
7 8
S
S S
S S
S
S
S
S
S
S
S
S
S
S
S S S
height
heptagon
hexagon
S S S
S
S
histogram
hypotenuse
image
S S S
S S
S
improper fraction
increasing
S S S
S S
independent events
S S
Definition
equal chance of all events happening
customary unit of measure for length
general mathematical statement or rule
part of a whole number or part of a group
table that shows often each event happens or
each item occurs
view of a 3D figure from the front
relation in which every value of x has a unique
value of y
using multiplication to find the total number of
outcomes of two or more events occuring
customary unit of measure for capacity
metric unit of measure for mass
pictoral way to show data
more than
more than or equal to
largest factor of two or more numbers
perpendicular line between the bases of a
figure
7-sided polygon
6-sided polygon
graph in which the labels for the bars are
numerical intervals
longest side of a right triangle
copy of the original figure
fraction in which the numerator is larger than
the denominator; greater than one
getting larger; going up in value
two or more events that do not affect each
other
finding a missing measurement by using a
proportion
mathematical sentence that compares two
unequal expressions
The process of drawing logical conclusions from
data known or assumed to be true.
indirect measurement
S S S
inequality
S S S
inference
S S S
input
The number on which a function machine
performs one or more operations to produce
S S S an output.
integer
S S S The set of whole numbers and their opposites
S= Students should be using
T= Only teacher should be using
Allen ISD
Revised June 2011
6th - 8th grade Math Terms
Term
irrational number
isosceles triangle
Definition
The difference between the upper quartile and
S the lower quartile
The point where two or more lines cross
S
S S S Operations that undo each other
the set of all numbers that cannot be
S expressed as finite or repeating decimals
a triangle with at least two equal sides
S S
kilo-
S S S prefix in the metric system that refers to 1000
interquartile range
intersection
inverse operation
6 7 8
the area of the surfaces of a three dimensional
S figure not including the bases
lateral area
lateral face
leaf
S
least common denominator
S S
least common multiple
S S
leg
s
length
S S
less than
S S
less than or equal to
like fractions
S
like terms
line
line graph
line of reflection
line of symmetry
line plot
line segment
S a face that is not a base in a prism or a pyramid
the digit or digits on the right side of a stem
S and leaf plot, usually the ones digit
the smallest number into which the
denominators will divide exactly
the smallest number that is a multiple of two or
more numbers
the sides of a triangle that are adjacent to the
S right angle of a right triangle
a measure of the distance of an object from
S end to end
A quantity that is smaller than another given
S number.
A quantity that is the same as or smaller given
S number.
fractions with common denominators
terms that include the same variables raised to the
S same powers
a connected set of points extending forever in
both directions
S
data displayed in a line to show change over
S S S time
the line over which two figures are mirror
images of each other
S
a line along which a figure can be folded so that
S S S the two resulting halves are congruent
a diagram showing frequency of data on a number
S S S line
a part of a line defined by two endpoints
S
S= Students should be using
T= Only teacher should be using
Allen ISD
Revised June 2011
6th - 8th grade Math Terms
Term
6 7 8
Definition
a figure that can be folded along a line so that the
two halves match exactly
line symmetry
S
linear equation
liter
lower quartile
an equation with two variables (x and y) that takes
the genreal form y = mx+ b, where m is the slope of
S the line and b is the y-intercept
S S S a metric unit of capacity
S the median of the lower 50% of a set of data
mean
measures of central tendency
the sum of a set of numbers divided by the number
of elements in the set. Often referred to as the
S S S average
S S mean, median, and mode
A representation of how spread out or
S scattered a set of data is
measures of variation
median
meter
S S S the middle number in an ordered set of numbers
S S S the metric unit of length
metric system
mile
milli-
S S S a system of meaurement based on powers of 10
S S S standard customary unit of measuring length
S S prefix in the metric system that refers to 1/1000
mixed number
S S S a number with both a whole number and a fraction
the number or element that occurs most frequently in
S S S a set of data
mode
monomial
more than
multiple
multiple representations
multiplicative inverse
mutually exclusive
negative number
nets
nonagon
non-proportional
nth term
numerator
S an algebraic expression consisting of a single term.
A quantity that is greater than another given
number.
S S
the product of a given number and an integer
S S
a variety of ways to display data (ie , graphs, tables,
i
n
ep
l
o
t
s
,
e
t
c
…)
S S l
S S Reciprocal of a number
S Two events that cannot occur at the same time
S S S numbers less than zero
a two-dimentional shape that can be folded into a
S S three-dimensional figure
a polygon with nine sides
S
S S S a comparison of 2 unequal ratios.
The term in the nth (any specified - 1st, 2nd, 3rd,
S S etc.. ) position
S S S the top number in a fraction
S= Students should be using
T= Only teacher should be using
Allen ISD
Revised June 2011
6th - 8th grade Math Terms
Term
6 7 8
numerical expression
S
obtuse angle
obtuse triangle
octagon
opposites
order of operations
S
S
ordered pair
origin
outcome
outlier
output
overestimate
parallel lines
parallelogram
pentagon
percent
percent of change
percent of decrease
S
S
Definition
a mathematical phrase containing numbers and
operations ( +, - *, ÷ ) but does not have an equal
Sk S sign
an angle whose measure is between 90 degrees and
180 degrees
S
a triangle with one obtuse angle
S
a polygon with eight sides
S
S numbers whose sum is zero
S S Rules for evaluating mathematical expressions
Two numbers (called x-coordinate and y-coordinate)
S S S written an certain order.
the point (0,0) on a coordinate graph where the xS S S axis and the y-axis intersect
S S S a possible result in a probability experiment
a piece of data that is much smaller or larger
S S S than the rest of the data in a set
the number or value that comes out of a
S S S process
an estimate greater than the exact numerical
answer
S
lines in the same plane that never intersect and
S S S are always the same distance apart
A quadrilateral with exactly one pair of parallel
S S S sides.
a polygon with five sides
S S
S S S a ratio that compares a number to 100
a way to describe a change in a quantity by
expressing it as a percent of the original
S S quantity
the absolute value of the percent of change
S S when an amount goes down
perimeter
S S the percent change when an amount goes up
comparing two equal ratios where a percent is
S S one of the quantities.
A number whose square root is a whole
S S number
the distance around the outside of a closed
S S S figure
perpendicular lines
S S S two lines that intersect to form a right angle
percent of increase
percent proportion
perfect square
S= Students should be using
T= Only teacher should be using
Allen ISD
Revised June 2011
6th - 8th grade Math Terms
Term
pi
6 7 8
Definition
the ratio of a circle's circumference to its
S S S diameter.
population
S S S a customary unit of measurement for capacity
a flat surface extending in all directions
S
an exact location in space
S
a closed plane figure, having three or more line
segments as sides
S S
a solid geometrical figure that has four or more
S S S plane faces
the set from which a sample of statistical data
S S is selected
position (in a sequence)
positive number
S S the ordinal number of a term in a sequence
S S S Numbers that are greater than zero
pound
a customary unit of measurement for weight
the number of times a base is multiplied by
S S itself, represented by an exponent
a factor that is also a prime number
S S
the expression of a composite number as a product
S S S of its prime factors
a whole number with exactly two factors, one and
S S S itself
pint
plane
point
polygon
polyhedron
power
prime factor
prime factorization
prime number
prism
probability
product
proper fraction
proportion
proportional
pyramid
S
S S S a solid figure that has two parallel, congruent bases
S S S a measure of the likelihood of an event
S S S the answer to a multiplication problem
a fraction where the numerator is less than the
denominator.
S
S S S a comparison of 2 equal ratios
S S having equal ratios
a three-dimensional shape where the base is a
polygon and the sides are triangles that have a
S S S common vertex
A theorem that states that in a right triangle,
the square of the length of the hypotenuse
equals the sum of the squares of the lengths of
2
2
2
S the legs. a +b = c
pythagorean theorem
quadrants
The four sections that the Cartesian coordinate
T S S system is divided into by the x and y axis
S= Students should be using
T= Only teacher should be using
Allen ISD
Revised June 2011
6th - 8th grade Math Terms
Term
quadrilateral
quart
quartiles
quotient
radical sign
6 7 8
Definition
a
polygon
with
4
sides
S S S
S S S a customary unit of measurement for capacity
the values that divide a list of numbers into four
S equal parts
S S S the answer to a division problem
S S a symbol that tells you to square root a number
radius (radii)
random
range
S
S
range (statistical)
rate
S
S
rate of change
ratio
rational number
ray
real number
reciprocals
rectangle
rectangular prism
reflection
regular polygon
repeating decimal
rhombus
right angle
right triangle
a line segment between the center and a point on a
S S circle
happening by chance, without order
S
S The set of all y-coordinates from each pair.
The difference between the highest and lowest
S S values
S S a ratio that compares different units
The speed at which a variable changes over a
specific period of time; represented by the slope
S of a line.
S S S a comparision of 2 numbers
S S a number that can be written as a fraction
a line with one end point
S
S all numbers on a number line
S S two numbers whose product is 1
S S S A parallelogram with four right angles.
A prism that has two congruent, parellel bases that
S S S are rectangles.
A flip across a line of reflection that creates a
S S S mirror image.
A polygon that has all equal sides and all equal
S S S angles.
S
S
S
S
S
S
S
S
S The amount of vertical increase between two points.
rise
rotation
run
sales tax
S
S
S
S
A decimal which has digits or a set of digits that
repeat infinitely.
A parallellogram with all sides of equal length.
An angle that measures 90 degrees.
A triangle with one right angle.
A transformation in which a geometric figure is
turned a certain number of degrees around a fixed
point or line.
S
S The horizontal distance between two points.
A percentage added to the total cost of goods or
S S services.
S= Students should be using
T= Only teacher should be using
Allen ISD
Revised June 2011
6th - 8th grade Math Terms
Term
scale drawing
Definition
A group that is used to represent a whole
S S population.
S S S The set of all possible outcomes
The ratio between the actual size of an object and a
S S proportional representation.
A proportionally correct drawing of an object or area
S S at actual, enlarged, or reduced size.
scale factor
scale model
scalene triangle
The number by which all elements of an object are
multiplied in order to create a proportional
S s enlargement or reduction
S S A proportionally correct model of reduced size.
A triangle with no sides of equal length.
S S
sample
sample space
scale
6 7 8
sequence
A way of expressing a number as the product of a
number between1 and 10 and a power of ten. For
S example, 687,000 = 6.87 × 105.
A graph of plotted points that show the relationship
S between two sets of data.
S S S half a circle
An ordered set of numbers, shapes or symbols
S S S arranged according to a rule
side view
similar
The left or right view of a three-dimensional figure
S
S S S Same shape but not necessarily the same size.
scientific notation
scatter plot
semicircle
Figures that have the same shape by not necessarily
the same size. Corresponding angles are congruent
S S and corresponding sides are proportional.
similar figures
A single event in a probability problem (for example:
the tossing of one coin).
simple event
S S
One outcome of an event where more than one
outcome is possible. Example: The probability of
choosing a woman if both women and men are in the
S sample.
simple random sample
simplest form
simplify
simulation
A fraction is in simplest form when the GCF of
the numerator and the denominator is 1.
S
reduce to lowest terms; use mathematical rules to
S S rewrite an expression in simplest form
A mathematical experiment that approximates
S a real-world process.
S= Students should be using
T= Only teacher should be using
Allen ISD
Revised June 2011
6th - 8th grade Math Terms
Term
skew lines
slope
solid
solution
6 7 8
Definition
Lines that do not lie in the same plane in space;
so they cannot be parallel or intersect.
S The ratio of the rise to the run.
S S S A three-dimensional shape.
S S S The answer to a problem or question.
S
sphere
S S
square
S S S
square root
squared
S S
S S
standard form
S S
A perfectly round geometric solid, consisting of
a set of points equidistant from a center point.
(1) A rectangle with congruent sides. (2) To
multiply a number by itself.
A number that when multiplied by itself
produces a given number. For example, 3 is
the square room of 9.
A number multiplied by itself.
A number written with one digit for each place
value.
The branch of mathematics concerning the
collection and analysis of data.
The left side (usually the tens section) of a stem
and leaf plot.
A data display that shows groups of data
arranged by place value.
An angle that measures 180 degrees.
The answer to an addition problem
statistics
S S S
stem
S S S
stem and leaf plot
straight angle
sum
S S S
S S
S S S
supplementary angles
S S S A pair of angles that measure exactly 180 degrees.
The sum of the areas of all the faces of a geometric
S solid, measured in square units.
A method of collecting statistical data in which
people are asked to answer questions.
S S
S S S A way to display data.
Mark used for counting.
S
S S A percentage added to the total cost.
S S S An element or number in a sequence
S S S A decimal whose digits end.
surface area
survey
table
tally mark
tax
term (in a sequence)
terminating decimal
theoretical probability
Three Dimensional Figure
tip
ton
S S S Probability based on known characteristics or facts.
S S S A figure that has length, width, and height.
The amount you gives extra over the cost to a
S S person who provides a service.
S S S A measure of mass that equals 2,000 pounds.
S= Students should be using
T= Only teacher should be using
Allen ISD
Revised June 2011
6th - 8th grade Math Terms
Term
6 7 8
top view
S
Definition
The view looking down on a three-dimensional
figure.
transformation
A mathematical process that changes the shape or
S S S position of a geometric figure.
translation
A transformation in which a geometric figure slides to
S S S another position without rotation or reflection.
tree diagram
triangle
triangle vertex
triple
twice
two dimensional figure
unbiased sample
underestimate
unit rate
S S S A quadrilateral with exactly one pair of parallel sides.
A branching diagram that shows all possible
combinations or outcomes of an experiment.
S S
S S A three-sided polygon.
The common point of two rays of an angle.
S
Three times.
S S
Two times.
S S
S S S A figure that has length and width.
S A sample that represents the entire population.
an estimate less than the exact answer
S
S S S The rate with a denominator of 1.
unlike fractions
S
trapezoid
upper quartile
variable
verbal expression
venn diagram
vertex
S
S S S
S S
S S
S S S
vertical angles
S
vertical line test
S
Fractions that have different denominators
The median of the upper half of a data set,
abbreviated UQ.
Symbol (usually a letter) that represents a
number
An expression written in word form.
A diagram used to show relationships between
sets.
The common point of two rays of an angle, two
sides of a polygon, or three or more faces of a
polyhedron.
angles that are opposite of each other at
intersecting lines
A test used to determine whether a relation is a
function. If any vertical line crosses the graph
of a relation more than once, the relation is not
a function.
The number of cubic units needed to fill the
space occupied by a solid.
The measure of the distance of an object from
side to side.
volume
S S S
width
S S S
x-axis
S S S The horizontal number line of a coordinate plane.
S= Students should be using
T= Only teacher should be using
Allen ISD
Revised June 2011
6th - 8th grade Math Terms
Term
x-coordinate
yard
y-axis
y-coordinate
zero pair
6 7 8
Definition
The first number in an ordered pair which tells the
distance to move right or left from the origin on a
S S S coordinate plane.
A customary unit of measurement. Three feet or 36
S S S inches.
S S S The vertical number line of a coordinate plane.
The second number in an ordered pair which tells the
distance to move up or down from the origin on a
S S S coordinate plane.
A positive and negative numer that cancel each other
out.
S
S= Students should be using
T= Only teacher should be using
Allen ISD
Revised June 2011