1. acute angle An angle with a measure less than 90 degrees

2. addend Any number that is being added 4 + 4= 8

3. analog time Time displayed on a timepiece having hour and minute hands

4. area The measure, in square units, of the inside of a plane figure

5. array A rectangular arrangement of objects in equal rows or columns

6. axis A perpendicular ray on a grid

7. bar graph A graph that uses bars of different heights to compare information

8. base The top or bottom of a three- dimensional (3-D) figure

9. capacity The measure that tells how much liquid a container can hold

10. circle A round two-dimensional figure

11. closed figure A figure with no gaps or openings

12. combination A group of items whose order does not matter

13. common denominator Denominator that is the same number in two or more fractions

14. cone A solid figure that has a circular base and one vertex

15. congruent Having the same size and shape. Congruent angles have the same measure. Congruent segments have the same length.

16. cube A rectangular solid having six square faces

17. cylinder A three-dimensional (3-D) figure with two circular bases

18. decimal A number with a decimal point Example: 3.72

19. denominator In a fraction, the number below the fraction bar numerator denominator

20. difference The answer to a subtraction equation

21. dividend The number that is being divided

22. divisor The number that divides the dividend

23. edge The line segment where two faces of a solid meet

24. Elapsed time The amount of time that passes between two events

25. endpoint A point that marks the beginning or end of a line segment or the beginning of a ray

26. equal to Shows that two values are the same

27. equation A statement that two mathematical expressions are equal

28. equivalent Having the same value

29. estimate An answer that is close to, but not equal to, an exact answer

30. expanded form A number written as the sum of the products of each digit and its place value. Example: 314 300 + 10 + 4

31. expression A variable, or any combination of numbers, variables, and symbols that represent a mathematical relationship Example: 24 X 2 + 5

32. face A plane figure that serves as one side of a solid figure

33. fact family A set of related addition and subtraction or multiplication and division equations using the same numbers. Example: 9x5=45 5x9=45 45/9=5 45/5=9

34. factor A whole number that divides evenly into another whole number. Example: 1, 3, 5, and 15 are factors of 15

35. fraction A number that names a part of a whole or part of a set of objects Example: 3 4

36. function A relation in which every input value has a unique output value

37. geometric pattern A pattern made up of shapes Example:

38. graph Drawing that uses lines, points, pictures, or bars to show information

39. greater than (>) Shows that one value is more than another value Example: 10 > 5

40. hexagon A polygon with six (6) sides

41. inequality A mathematical sentence that contains a symbol that shows the terms on either side of the symbol are unequal. Example: 3+4> 6

42. length The distance between two points or objects. It also refers to the longer side of a rectangle.

43. less than (<) Shows that one value is less than another value. Example: 2<6

44. line A straight path extending in both directions with no endpoints.

45. line of symmetry A line that divides a figure into two halves that are mirror images of each other

46. line segment A part of a line with two endpoints

47. mean (average) The number found by dividing the sum of a set of numbers by the number of addends.

48. median The middle number in an ordered set of data

49. mixed number A number that has a whole number part and a fraction part

50. mode The number(s) that occurs the most often in a set of data

51. multiple The product of a given whole number and another whole number. Example: Multiples of 4  4, 8, 12, 16, 20…

52. number sentence An equation or inequality with numbers

53. numerator In a fraction, the number above the fraction bar numerator denominator

54. obtuse angle An angle with a measure more than 90 degrees

55. octagon A polygon with 8 sides

56. ordered pair A pair of numbers used to locate a point on a coordinate grid. The first number tells how far to move across, and the second number tells how far to move up.

57. origin The point on a grid where the x- axis and the y-axis meet. On an ordered pair the origin is (0, 0).

58. parallel lines Lines that never intersect and are always the same distance apart.

59. parallelogram A quadrilateral whose opposite sides are parallel. Example:

60. pattern A relationship between a set of numbers or shapes

61. pentagon A polygon with 5 sides

62. perimeter The distance around a figure

63. perpendicular lines Two lines, segments or rays that intersect to form right angles

64. pictograph A graph that uses pictures to show and compare information

65. place value The value indicated by the position of the digit of a number

66. point Certain place or location

67. polygon A closed figure made up of line segments that meet at their endpoints.

68. prediction A statement of something that may happen in the future based on information

69. product The answer to a multiplication equation

70. pyramid A solid figure with a polygon base and triangular sides that meet at a single point

71. quadrilateral A polygon with 4 sides

72. quotient The result of division

73. ray A part of a line that has one endpoint and continues without end in one direction

74. rectangle A quadrilateral with four corners

75. rectangular prism A solid figure in which all six faces are rectangles

76. reflection (flip) A transformation that produces the mirror image of a figure

77. rhombus A parallelogram with four equal sides

78. right angle An angle that measures exactly 90 degrees

79. right triangle A triangle that has a 90 degree angle

80. rotation (turn) A movement of a figure that turns that figure around a fixed point

81. rounding A process used to approximate a value

82. scale An arrangement of numbers that increase by uniform intervals

83. sphere A solid figure that has all points the same distance from the center

84. square A rectangle with all four sides the same length

85. standard form The way a number is written in numerals Example: 367

87. sum The answer to an addition equation.

88. table An information display that uses rows and columns to show information

89. tally chart A table that uses tally marks to record data

90. Three-dimensional figure (3D) A figure that has length, width, and depth

91. translation (slide) A movement of a figure to a new position without turning or flipping it

92. trapezoid A quadrilateral with exactly one pair of parallel sides

93. triangle A closed figure with three sides and three vertices

94. triangular pyramid A pyramid with a triangular base

95. Vertex (corner) A point where lines, rays, sides of a polygon or edges of a polyhedron meet

96. volume The amount of space that a solid figure can hold

97. whole numbers The counting numbers plus zero

98. x-axis The horizontal number line in a grid

99. x-coordinate The first number in an ordered pair

100. y-axis The vertical number line in a grid

101. y-coordinate The second number in an ordered pair