7th Grade Math Vocabulary
Terms in this set (158)
The distance of a number from zero on the number line. Always Positive
a triangle with no angle measuring 90 degrees or more
a number that is the same distance from 0 on the number line, but in the opposite direction
a group of numbers, symbols, and variables that express an operation or a series of operations
area of a circle
The measure, in square units, of the interior of a 2-dimensional figure. The formula for the area of a circle A = πr²
The measure, in square units, of the interior region of a 2-dimensional figure or the surface of a 3-dimensional figure
area is the measurement of the 2-dimensional region enclosed by the quadrilateral
the perpendicular distance from a vertex to the opposite side of a plane figure
area of a triangle
The area of triangle is A = ½bh, where b = the base and h = the vertical height
the distance around a circle, which equals a little more than three times is diameter
a reference line from which distances or angles are measured in a coordinate grid. (Plural - axes)
a fee charged by a broker or agent for his/her service in facilitating a transaction
for two or more fractions, a common denominator is a common multiple of the denominators
two angles are complementary is they add up to 90 degrees (right angle). They don't have to be next to each other
A number with a value that is always the same.
base of a polygon
The side of a polygon that is perpendicular to the altitude or height
A numerical factor in a term of an algebraic expression.
Any common factor of two or more numbers
The area created by a plane cutting through a solid
The entire collection of items that is the focus of concern. A population can be any size and while the items need not be uniform, the items must share at least one measurable feature.
An ordered pair of numbers that identify a point on a coordinate plane.
A 2- dimensional system in which the coordinates of a point are its distances from two intersecting, usually perpendicular, straight lines called axes, (Also called coordinate grid or coordinate system)
An ordered pair of numbers that identify a point on a coordinate plane.
Information, especially numerical information. Usually organized for analysis.
The quantity below the line in a fraction. It tells the number of equal parts into which a whole is divided.
To find a number close to an exact amount; an estimate tells about how much or about how many.
A set of outcomes to which a probability is assigned.
Also know as a coordinate grid. A 2-dimensional system in which the coordinates of a point are its distances from two intersecting, usually perpendicular straight lines called axes.
A three-dimensional shape with six square faces.
A drawing that represents a mathematical situation.
In a function, a variable whose value is determined by the value of the related independent variable.
a x (b + c) = (a x b) + (a x c)
a x (b - c) = (a x b) - (a x c), where a, b, and c stand for any real numbers
The set of whole numbers and their opposites.
A diagram showing frequency of data on a number line.
A triangle whose sides are all the same length.
If two rations have the same value when simplified, then they are called this.
The number that tells how many equal factors there are.
The number of times an event occurs within a specific time period.
Any combinations of points, lines, planes, or curves in two or three dimensions.
A statement that two mathematical expressions are equal.
Naming the same number
To find the value of a mathematical expression.
A variable or combination of variables, numbers, and symbols that represents a mathematical relationship.
Something given voluntarily or beyond obligation usually for some service: tip.
A way of representing part of a whole or part of a group by telling the number of equal parts in the whole and the number of parts you are describing.
A pictorial device used to show a numerical relationship.
The perpendicular distance from a vertex to the opposite side of a plane figure.
A fraction with a numerator greater than (or equal to) its denominator
A mathematical sentence that compares two unequal expressions using one of the symbols <, >, ≤, ≥, or ≠.
A triangle that has at least two congruent sides.
Used to compare two numbers when the first number is larger than the second number.
A bar graph in which labels for the bars are numerical intervals.
A variable in a mathematical equation whose value determines that of a dependent variable.
Having no boundaries or limits.
The act or process of deriving logical conclusions from premises known or assumed to be true.
least common multiple (LCM)
The smallest common multiple of a set of two or more numbers.
Less than is used to compare two numbers when the first number is smaller than the second number.
The largest amount; the greatest number in a data set.
measures of central tendency
An average; a single value that is used to represent a collection of data. Three commonly used types of averages are mode, median, and mean.
The amount by which a price is reduced.
A standard procedure suitable for dividing simple or complex multi-digit numbers.
The product of a whole number and any other whole number.
An event that is most likely to happen.
The sum of a set of numbers divided by the number of elements in the set. (A type of average)
The middle number of a set of numbers when the numbers are arranged from least to greatest, or the mean of two middle numbers when the set has two middle numbers.
The smallest amount; the smallest number in a data set.
A number with an integer and a fraction part.
An amount added to the cost price to determine the selling price; broadly: profit
Percent decrease is a measure of percent change, which is the extent to which a variable loses value. It is found by comparing the initial (or before) and final (or after) quantities according to a specific formula. IT is assumed that both the initial and the final quantities are positive (larger than 0).
Numbers less than 0
To state in advance on the basis of observation, experience, or scientific reason.
A diagram that represents numbers as points on a line.
The number or expression written above the line in a fraction.
Percent error is the difference between a predicted value and the actual value. Percent errors tell you how close or how far you came to the actual answer.
A triangle that contains one angle with a measure greater than 90 degrees (obtuse angle) and two acute angles.
The intersection of the x- and y-axes in the coordinate plane, described by the ordered pair (0, 0).
Having a different sign but the same numeral.
A pair of numbers that gives the coordinates of a point on a grid in this order (horizontal (x) coordinate, vertical (y) coordinate). Also known as a coordinate pair.
A number in a set of data that is much larger or smaller than most of the other numbers in the set.
A special ratio that compares a number to 100 using the symbol %.
A closed figure formed from line segments that meet only at their endpoints
A 3-dimensional figure that has two congruent and parallel faces that are polygons. The remaining faces are parallelograms.
An equation showing that two rations are equivalent.
The four sections of a coordinate grid that are separated by the axes.
Percent increase is measure of percent change, which is the extent to which a variable gains value. It is found by comparing the initial (or before) and final (or after) quantities according to a specific formula. It is assumed that both the initial and the final quantities are positive (larger than 0).
Numbers that are greater than zero.
The result of multiplication.
A polyhedron whose base is a polygon and whose other faces are triangles that share a common vertex.
A four-sided polygon.
The result of the division of one quantity by another.
The difference between the greatest number and the least number in a set of numbers.
A comparison of two numbers using division.
A number that can be expressed as a ratio of two integers.
Two numbers whose product is 1. Also called multiplicative inverses.
The ratio of an actual number of favorable events to the total possible number of events; often taken as an estimate of probability.
A ratio comparing two different units
A quadrilateral with two pairs of congruent, parallel sides and four right angles.
A selection that is chosen randomly (purely by chance, with no predictability.)
A triangle that has one 90 degree angle.
A geometric figure with 3 dimensions.
A rational number which multiplies a variable.
The science of collecting, organizing, representing, and interpreting data.
The set of all possible outcomes of a random process.
If the sum of the measures of two angles is 180 degrees, then the two angles are supplementary. If two angles form a straight line, then they are supplementary.
A number, variable, product, or quotient in an expression. A term is not a sum or difference.
A quick method for calculating the interest charge on a loan.
The replacement of the letters in an algebraic expression with known values.
The result of addition.
An organized way to list data. Tables usually have rows and columns of data.
A drawing of an object or structure showing all parts in the same proportion of their true size.
positive or negative number.
A precisely fixed quantity used to measure volume.
A rate with a denominator of 1.
A pair of angles is said to be vertical if the angles share the same vertex and are bounded by the same pair of lines but are opposite to each other. Such angles are congruent and thus have equal measure.
The point at which two line segments, lines, or rays meet to form an angle. (plural - vertices)
Any of the numbers 0, 1, 2, 3, 4, 5, and so on.
In an ordered pair, the value that is always written first.
In an ordered pair, the value that is always written second.
A fee charged by a government on a product, income, or activity.
A quantity that changes or can have different values. A symbol, usually a letter, that can stand for a variable quantity.
The number of cubic units it takes to fill a figure.
In a Cartesian grid, the vertical axis.
base of an exponent
The number that is raised to a power.
To increase or decrease proportionately in size.
To express a fraction in simplest form.
is a value that, when multiplied by itself, gives the number.
A quadrilateral with two pairs of parallel and congruent sides.
a line segment that passes through the center of the circle with endpoints on the circle.
a parallelogram with 4 equal sides. Opposite angles are congruent.
A polygon that is both equilateral and equiangular. Its center is the point that is equidistant from its vertices.
the most frequently occurring number in a data set. There can be more than one or no mode.
probability based on reasoning written as a ratio of the number of favorable outcomes to the number of possible outcomes.
probability based on an experiment written as a ratio comparing the number of times the event occurred to the number of trials.
is a relationship between two variable quantities x and y, where y is a constant multiple (k) of x. This can be expressed in the simple equation, y = kx.
A set of values that satisfy a given set of equations or inequalities.
An event that will probably not happen. An outcome with a probability between 0 and 0.5.
The ratio of a circle's circumference to its diameter. Equal to 3.14159265358979323846... (the digits go on forever without repeating) A rough approximation is 22/7 = 3.14
The chance that a particular outcome will occur, measured as a ratio of the total possible outcomes.
A tool used to measure and draw angles.
A decimal which has a finite number of digits.
A polygon with three angles and three sides.
Divide into two equal parts.
alternate interior angles
Angles created when a transversal crosses two (usually parallel) lines. Each pair of these angles are inside the parallel lines, and on opposite sides of the transversal.
alternate exterior angles
Angles created when a transversal crosses two (usuallyparallel) lines. Each pair of these angles are outside the parallel lines, and on opposite sides of the transversal.
an amount that is subtracted from the regular price of an item.
A mathematical method for writing longer multiplication problems in a simplified manner.
the angles that occupy the same relative position at each intersection where a straight line crosses two others. If the two lines are parallel, the corresponding angles are equal.
a possible result of a probability experiment.
All possible arrangements of a collection of things, where the order is important
The sign √ placed before a quantity, indicating extraction of the root designated by a raised integer.
When extracting a square root, the raised integer is customarily omitted.
A quadrilateral with one set of parallel lines. It is not a parallelogram because only one pair of sides is parallel
A line that cuts across two or more (usually parallel) lines.
In a Cartesian grid, the horizontal axis.
3-D. Existing in 3 dimensions; having length, width, and height.
A triangle that has no congruent sides.
order of operations
Rules describing what sequence to use in evaluating expressions.
(1) Evaluate within grouping symbols.
(2) Do powers or roots.
(3) Multiply or divide left to right.
(4) Add or subtract left to right.
Two or more independent events considered together.