8th Grade Vocabulary List
First Set
1.
2.
3.
4.
5.
6.
7.
8.
Angle
Angle Sum Theorem
Bivariate data
Cluster
Coefficient
Cones
Congruent
Converse of the Pythagorean
Theorem
9. Coordinate Plane
10. Coordinates
11. Cube Root
12. Cylinders
13. Dilation
14. Distributive Property
15. Equation
16. Estimate
17. Exponent
18. Expressions
19. Exterior Angle
Second Set
20. Frequency
21. Function
22. Horizontal Axis
23. Input
24. Integer
25. Intercept
26. Irrational Number
27. Like Terms
28. Line
29. Line Segment
30. Linear Association
31. Linear Equation
32. Linear Function
33. Negative Association
34. Nonlinear Association
35. Number Line
36. Ordered Pairs
37. Outlier
38. Output
Third Set
39. Parallel lines
40. Perfect Cube
41. Perfect Square
42. Point
43. Positive Association
44. Proportions
45. Pythagorean Theorem
46. Radicals
47. Rate of Change
48. Rational Number
49. Reflection
50. Relative Frequency
51. Right Triangle
52. Rotation
Fourth Set
53. Scatter Plot
54. Scientific Notation
55. Similar
56. Similar Triangles
57. Slope
58. Sphere
59. Square Root
60. System of Equations
61. Translation
62. Transversal
63. Two-dimensional Shape
64. Two-Way Table
65. Unit Rate
66. Variable
67. Vertical Axis
68. Volume
8th Grade Vocabulary List
1. Angle- two line segments or two rays that have a common endpoint.
2. Angle Sum Theorem- a theorem that states that the angle measures in any triangle adds up to 180
degrees.
3. Bivariate data- data for two variables.
4. Cluster- when data is gathered around a particular value.
5. Coefficient- a number multiplied by a variable in an algebraic expression.
6. Cone- a three-dimensional figure with a circular or elliptical base and one vertex.
7. Congruent- having the same size, shape, and measure.
8. Converse of the Pythagorean Theorem- states that whenever the sum of the squares of two sides equal to
the square of the third side of the triangle, the triangle is a right triangle.
9. Coordinate Plane- a two-dimensional region determined by a pair of axes and that uses numerical values
to represent the location of an object.
10. Coordinates- A set of numbers used to show the position of a point on a line, graph, or map. Example:
on a rectangular grid, one of these indicates the horizontal position and the other one indicates the
vertical position
11. Cube Root- one of three equal factors of a given number. Ex: cube rube of 64 is 4 because 4 x 4x 4 = 64
12. Cylinder- a three-dimensional object with two parallel, congruent, circular bases.
13. Dilation- a transformation that changes the size of an object, but not the shape; shrinking or enlarging of
a figure.
14. Distributive Property- the sum of two addends multiplied by a number is the sum of the product of each
addend and the number. Ex: a (b + c) = ab + ac
15. Equation- a mathematical sentence that contains an equal sign.
16. Estimate- To find a number or quantity that is close to the exact amount.
17. Exponent- the number of times a number or expression is used as a factor of repeated multiplication.
18. Expression- a mathematical phrase involving at least one variable, and can include numbers or
operations.
19. Exterior Angle – formed when you extend a side of a polygon.
20. Frequency- the number of times a number or an event occurs in a set of data.
21. Function- A relation in which every value of x has a unique value of y
22. Horizontal Axis- the x-axis on a coordinate grid.
23. Input- the number that is substituted for the variable in a function or rule machine.
24. Integer - the set of whole numbers and their opposites: negative numbers, positive numbers, and zero,
but no fractions or decimals.
25. Intercept- the point on a line that intersects either the horizontal or vertical axis.
26. Irrational Number- a number whose decimal form is non-terminating and non-repeating; cannot be
written as a ratio.
27. Like Terms- terms in an algebraic expression that have the same variable raised to the same power; only
the coefficients of like terms can be different.
28. Line- An infinite set of points forming a straight path extending in 2 directions.
29. Line Segment- the part of a line between two points on the line.
30. Linear Association- on a graph, data values that follow a linear pattern.
31. Linear Equation- an algebraic expression containing two or more variables set equal to a value.
32. Linear Function- an equation whose graph is a straight line and can be written in the form y=mx+b.
33. Negative Association- on a scatter plot, y values decrease as x-values increase. (fall from left to right)
34. Nonlinear Association- on a graph, data values that do not create a straight line.
35. Number Line- a diagram that represents numbers in order as evenly spaced points on a line.
36. Ordered Pairs- A set of two numbers (x, y) where the first coordinate represents a horizontal position
and the second coordinate represents the vertical position.
37. Outlier- A piece of numerical data that is much smaller or larger than the rest of the data in the set.
38. Output- the number that is the result of a function or rule machine
39. Parallel lines – lines that lie in the same plane and do not intersect.
40. Perfect Cube- a number that is the exact cube of an integer.
41. Perfect Square- a number that is the square of a whole number.
42. Point- an exact location in space with no length or width.
43. Positive Association- on a scatter plot, y values increase as x-values increase. (rise from left to right)
44. Proportion- an equation which states that two ratios are equal.
45. Pythagorean Theorem- A theory that says that the sum of the squares of the lengths of the two legs of a
right triangle is equal to the square of the length of the hypotenuse.
46. Radical- a symbol, √, used to show the square root of a number.
47. Rate of Change- the speed at which a variable changes over a period of time. (also known as slope)
48. Rational Number- a number that can be written as a/b where a and b are integers, and where b ≠ 0.
49. Reflection- Flipping a 2-dimensional shape to create a mirror image on the other side of the line.
50. Relative Frequency- the ratio of the number of occurrences of a given type of event to the total number
of events.
51. Right Triangle- a triangle with a 90 degree angle.
52. Rotation- Turning a 2-dimensional shape a given direction and a given angle.
53. Scatter Plot- A graph with one point for each item being measured; the coordinates of a point represent
the measures of two attributes of each item
54. Scientific Notation- a method that expresses numbers that are too small or too large in a simpler form;
written as a decimal number between 1 and 10 multiplied by a power of 10.
55. Similar- figures having the same shape, but not the same size.
56. Similar Triangles – triangles having the same shape, but are different sizes.
57. Slope- the measure of the steepness of a line. In y=mx+b, m represents this.
58. Sphere- A three-dimensional figure that is round; a set of points in space, all the same distance from one
point (Ex: baseball)
59. Square Root- A quantity that when squared gives the original quantity.
60. System of Equations- two or more equations that define a relationship between variables in a problem; it
can have no solution, one solution, or many solutions.
61. Translation - Sliding a 2-dimensional shape a given distance and given direction.
62. Transversal- a line that intersects two or more lines (usually parallel lines).
63. Two-dimensional shape- figures that have length and width, but no thickness.
64. Two-Way Table- shows data that relates to two different variables or categories.
65. Unit Rate- a comparison of two quantities that is written as a ration in which the denominator equals 1.
66. Variable- a symbol that stands for an unknown number
67. Vertical Axis – the Y-axis on a coordinate grid.
68. Volume - the amount of space occupied by an object.
Definition Sources:
-
http://intermath.coe.uga.edu/
http://mathisfun.com/
http://dictionary.reference.com/
http://mathcentral.uregina.ca/RR/glossary/mid
dle/glossaryab.html