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7th Grade Math Vocabulary
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Gravity
Key Concepts:
Terms in this set (50)
Cross Section
The intersection of a plane and a solid.
Reciprocal
The multiplicative inverse of a number
Permutation
An arrangement, or listing, of objects in which order is important.
Transversal
a line that intersects two parallel lines
Quadrant
one of four sections into which the coordinate plane is divided
Factorial
the product of an integer and all the integers below it
Polyhedron
A three-dimensional figure with faces that are polygons
Constant of Variation
a constant ratio in a direct proportion (can also be called constant of proportionality)
Commission
An amount paid to an employee based on a percentage of the employee's sales
Combination
a grouping of items in which order does not matter
Direct Variation
The relationship between two variable quantities that have a constant ratio.
Base
The faces on the top and bottom of a figure that name the figure.
Principal
The amount of money borrowed
Rational Number
The set of numbers that can be written in the form a/b where a and b are integers and b does not equal 0.
Indirect Measurement
the technique of using similar figures and proportions to find a measure for an object that is too difficult t o measure directly.
Scale Factor
A scale written as a ratio in simplest form.
Lateral Face
In a polyhedron, a face that is not a base.
Fundamental Counting Principle (FCP)
uses multiplication to find the total number of outcomes with compound events
Proportion
An equation stating that two ratios are equal
Sample Space
the set of all possible outcomes of a probability experiment
Interquartile Range (IQR)
the difference between the first and third quartiles - (UQ - LQ)
Simulation
A mathematical experiment that approximates a real world process.
Coefficient
A numerical factor in a term of an algebraic expression
Term
a single number or variable, or numbers and variables multiplied together
Outlier
A value much greater or much less than the others in a data set
Like Terms
Terms whose variables and exponents are the same.
Mean Absolute Deviation (MAD)
the average distance between each data value and the mean
Integers
The set of whole numbers and their opposites
Ratio
A comparison of two quantities by division
Unit Rate
A rate with a denominator of 1.
Inference
A conclusion reached on the basis of data and reasoning
Probability
likelihood that a particular event will occur
Theoretical Probability
The ratio of the number of equally likely outcomes in an event to the total number of possible outcomes. What SHOULD happen
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. What DOES happen.
Compound Event
An event consisting of two or more simple events.
Independent Event
The outcome of one event does not affect the outcome of the second event
Dependent Event
The outcome of one event does affect the outcome of the second event
Rate of Change
A rate that describes how one quantity changes in relation to another
Constant of Proportionality
the constant value of the ratio of two proportional quantities x and y
Percent of Change
the percent a quantity increases or decreases from its original amount
Markup
the amount added to the cost of merchandise to establish the selling price
Complementary Angles
Two angles whose sum is 90 degrees
Supplementary Angles
Two angles whose sum is 180 degrees
Adjacent Angles
Angles that have a common side and a common vertex (corner point).
Vertical Angles
A pair of opposite congruent angles formed by intersecting lines
Repeating Decimal
A decimal that repeats a digit or group of digits forever.
Likely Event
An event that is most likely to happen.
Absolute Value
The distance a number is from zero on a number line
Event
A set of outcomes to which a probability is assigned.
Frequency
The number of times an event occurs
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