Seventh Grade Math Vocabulary
absolute value
the distance of a number from zero on a number line
acute triangle
a triangle with all angles measure less than 90 degrees
algebraic expression
an expression that contains at least one variable
box-and-whisker plot
a graph that displays the highest and lowest quarters of data as
whiskers, the middle two quarters of the data as a box, and the
median
central angle
an angle with its vertex at the center of a circle
coefficient
the number that is multiplied by the variable in an algebraic expression
compatible number
numbers that are close to the given number that make estimation or
mental calculation easier
constant
a value that does not change
correlation
the description of the relationship between two data sets
cross product
the product of numbers on the diagonal when comparing two ratios
cumulative
frequency
the sum of successive data items
diagonal
a line segment that connects two non-adjacent vertices of a polygon
diagram
a drawing or picture used in a question
double-bar graph
a bar graph that compares two related sets of data
double-line graph
a line graph that shows how two related sets of data change over
time
equilateral triangle
a triangle with three congruent sides
event
an outcome or sets of outcomes of an experiment or situation
experimental
probability
the ratio of the number of times an event occurs to the total number
of trials, or times that the activity is performed
extreme
the least and greatest value in a data set; also known as the lower
and upper extreme
2006-2007
Seventh Grade Math Vocabulary
evaluate
to find the value of a numerical or algebraic expression
fair
when all outcomes of an experiment are equally likely
frequency table
a table that lists items together according to the number of times or
frequency that the items occur
function
an input-output relationship that has exactly one output for each input
hypotenuse
in a right triangle, the side opposite the right angle
inequality
a mathematical sentence that shows the relationship between
quantities that are not equivalent
interest
the amount of money charged for borrowing or using money, or the
amount of money earned by saving money
isosceles triangle
a triangle with at least two congruent sides
kite
a quadrilateral with two pairs of adjacent, congruent sides
legs
in a right triangle, the sides that include the right angle
like terms
two or more terms that have the same variable raised to the same
power
obtuse triangle
a triangle containing one obtuse angle
outcome
a possible result of a probability experiment
percent of change
the amount stated as a percent that a number increases or decreases
population
the entire group of objects or individuals considered for a survey
principal
the initial amount of money borrowed or saved
proportion
an equation that states two ratios are equivalent
Pythagorean
theorem
in a right triangle, the square of the length of the hypotenuse is equal
to the sum of the squares of the lengths of the legs.
quadrant
each region of the coordinate plane, divided by the x- and y-axis
2006-2007
Seventh Grade Math Vocabulary
quartiles
three values that divide a data set into fourths; one of these is called
the median , and the other two are the lower and upper quartiles, also
known as the first and third quartile
radical sign
the symbol used to represent the non-negative square root of a
number
rate
a ratio that compares two quantities measured in different units
rational number
any number that can be expressed as a ratio of two integers
rectangle
a parallelogram with four right angles
reflection
a transformation of a figure that flips the figure across a line
repeating decimal
a decimal in which one or more digits repeat infinitely
rhombus
a parallelogram with all sides congruent
right triangle
a triangle containing a right angle
rotation
a transformation in which a figure is turned around a point
sample
a part of the population
scalene triangle
a triangle with no congruent sides
scientific notation
a method of writing very large or very small numbers by using powers
of ten
similar
figures with the same shape, but not necessarily the same size
simple interest
a fixed percent of the principal
simplest form
a fraction in which the numerator and denominator have no common
factors other than one
simplify
to write a fraction or expression in simplest form
skew lines
lines that lie in different planes that are neither parallel nor intersecting
solution set
the set of values that make a statement true
square
a rectangle with four congruent sides
2006-2007
Seventh Grade Math Vocabulary
standard form
a number written using digits
stem-and-leaf plot
a graph used to organize and display data so that the frequencies
can be compared
surface area
the sum of the areas of the faces, or surfaces, of a three-dimensional
figure
symmetry
a mirror image of itself
termination decimal
a decimal number that ends or terminates
theoretical
probability
the ratio of the number of equally likely outcomes in an event to the
total number of possible outcomes
transformation
a change in the size or position of a figure
translation
a movement (slide) of a figure along a straight line
transversal
a line that intersects two or more lines
trapezoid
a quadrilateral with exactly one pair of parallel sides
unit rate
a rate in which the second quantity in the comparison is one unit
vertical angles
a pair of opposite congruent angles formed by intersecting lines
2006-2007