1. Third Grade by Serena Georges Math Vocabulary Words

2. 2-dimensional figure Plane figures that have length and width

3. 3-dimensional figure 3-dimensional figures with edges, faces and/or corners

4. addend 2 + 3 = 5; The addends are 2 and 3. A number that is added to another in an addition problem

5. addition 3 + 2 = 5 The process of finding the total number of items when two or more groups of items are joined

6. analog clock A clock with numbers 1 through 12 around the face with rotating hands to show hours, minutes and seconds

7. area area = 9 square units The number of square units needed to cover a surfacesquare

8. array 3 x 4 = 12 An arrangement that shows objects in rows and columns

9. attribute Characteristics, size, shape and/or color

10. bar graph A graph that uses bars to show datadata

11. capacity The amount a container can hold when filled

12. centimeter 100 centimeters = 1 meter A metric unit for measuring lengthmetric

13. circle A closed 2D shape that is perfectly round

14. closed figure A figure that begins and ends at the same point point

15. cone A solid 3-d pointed figure that has a flat, round base with an apex

16. congruent figures Figures that have the same size and shape

17. corner vertex vertices The place where two or more edges meetedges

18. cube A solid figure with six congruent square faces and twelve vertices (corners)solid figure congruentsquarefaces

19. cubic units A standard unit for measuring volume The volume of this figure is 24 cubic units 3 x 2 x 4 = 24

20. cup Example: 2 cups = 1 pint A customary unit used to measure capacitycustomarycapacity

21. cylinder A solid 3-d figure that is shaped like a cansolid

22. decimal Examples: 0.5 five tenths 0.25 twenty-five hundredths A number with one or more digits to the right of the decimal pointdigitsdecimal point

23. decimal point A symbol used to separate dollars from cents in money and to separate the ones place from the tenths place in decimalsmoneydecimals

24. degree A unit for measuring temperature

25. degree Celsius (°C) A metric unit for measuring temperaturemetric

26. degree Fahrenheit (°F) A customary unit for measuring temperaturecustomary

27. denominator The number below the bar in a fraction. It tells the total number of equal parts or groups into which the wholefraction

28. difference Example: 8 - 3 = 5 5 is the difference The answer in a subtraction problem subtraction

29. digit 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 Any one of the ten symbols 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9 used to write numbers

30. digital clock A clock that uses numerals only to tell the time

31. divide 6 divided by 3 = 2 To separate into equal groups

32. dividend 35 ÷ 5 = 7 The dividend is 35. The number that is to be divideddivided

33. divisor 18 ÷ 3 = 6 The divisor is 3. The number that divides the dividend dividesdividend

34. elapsed time The amount of time that passes from the start of an activity to the end of that activitytime From 3:00 p.m. to 4:00 p.m. the elapsed time is one hour.

35. edge The line segment where two faces of a solid figure meetline segmentfaces solid figure

36. equal to 45 Sign used to show numbers with the same value

37. equally likely It is equally likely to pull a circle and a square because they have equal amounts Outcomes that have the same chance of happening

38. equivalent fractions Two or more fractions that name the same amountfractions

39. estimate To use rounding to find out about how many Example: 23 20 36 +40 About 60

40. even number 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20... A whole number that has 0, 2, 4, 6, or 8 in the ones placewhole number

41. expanded form 241 = 200 + 40 + 1 A way to write numbers by showing the value of each digitdigit

42. face A flat surface of a 3-d figure

43. fact family Related facts using the same numbers Examples: 2 + 4 = 6 6 - 4 = 2 4 + 2 = 6 6 - 2 = 4 or 3 X 6 = 18 18 ÷ 6 = 3 6 X 3 = 18 18 ÷ 3 = 6

44. factors 3 x 8 = 24 The factors are 3 and 8 The numbers that are multiplied to give a product

45. fraction A number that names part of a whole (region) or part of a group

46. foot (ft) A customary unit used to measure length. 1 foot = 12 inches

47. gallon A customary unit used to measure capacity 4 quarts = 1 gallon

48. gram (g) A paper clip has a mass of about 1 gram. A metric unit used to measure mass

49. greater than 64 56 Sign used to compare numbers

50. hexagon A polygon with 6 sides and 6 angles

51. heptagon A polygon with 7 straight sides and 7 angles

52. inch A customary unit used to measure length 12 inches = 1 foot

53. kilogram (kg) A metric unit used to measure mass 1,000 grams (g) – 1 kilogram (kg)

54. kilometer (km) A unit used to measure distance 1 km – 1,000 meters (m)

55. length The distance of an object measured from one end to the other

56. least likely It is least likely to pull a triangle An event that has a lesser chance of happening

57. less than 56 64 Sign used to compare numbers

58. line segment Part of a line with two endpoints

59. line symmetry A line that divided a figure into two congruent parts

60. liter (L) A metric unit that is used to measure capacity

61. meter (m) A metric unit used to measure length or distance

62. measurement The act of measuring to determine the size of something

63. mile (mi) A customary unit used to measure length or distance

64. milliliter (ml) A small spoon holds about 5 milliliters. A metric unit used to measure capacity 1,000 milliliter (ml) = 1 liter (L)

65. millimeter (mm) A unit of length 10 millimeter (mm) = 1 centimeter (cm)

66. minutes Minutes measure short amount of time. There are 60 minutes in one hour.

67. minute hand The long hand on a clock

68. most likely It is most likely to pull a square because there are more squares than circles An event that has a greater chance of happening

69. multiplication 3 x 4 = 12 An operation using repeated addition with two or more numbers

70. number line A line with equally spaced ticks and numbers

71. numeral 45 23 67 18 98 A symbol that stands for a number

72. numerator The number above the fraction bar in a fraction. Tells how many equal parts.

73. open figure A figure that does not begin and end at the same point

74. ordered pair A pair of numbers used to locate a point on a grid. The first number tells the left-right position and the second number tells the up-down position

75. octagon A polygon with 8 sides and 8 angles

76. odd number A whole number that has 1, 3, 5, 7 or 9 in the ones place Example: 1, 3, 5, 7, 9, 11, 13, 15, 17, 19,…..

77. ounce An ounce of gold A customer unit used to measure weight

78. ordinal number A number telling order or position

79. parallel lines Lines that never cross and are always the same distance apart Example:

80. parallelogram A plane figure with 2 pairs of parallel sides, 2 pairs of equal angles and 2 pairs of equal sides

81. pattern Repeated design or number sequence

82. pentagon A polygon with 5 sides and 5 angles

83. perimeter The distance around a figure 2 cm + 3 cm + 3 cm = 8 cm The perimeter of this figure is 8 cm.

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

85. pint A customary unit used to measure capacity 2 cups = 1 pint

86. place value Hundreds Tens Ones 4 5 0 The value of the 5 is 50 or 5 tens. The value of a digit depending on its place in number

87. plane figure A figure in a plane that is formed by lines that are curved, straight or both

88. polygon A closed plane figure with straight sides

89. pound A customary unit used to measure weight

90. point A position on a number line or in space

91. product The answer to a multiplication problem 6 X 2 = 12 The product is 12

92. quadrilateral A polygon with 4 angles and 4 sides

93. quart A customary unit used to measure capacity 2 pints = 1 quart

94. quotient The answer in a division problem 35 ÷ 5 = 7 The quotient is 7

95. rectangle A plane figure with 4 sides and 4 right angles

96. rectangular prism A solid 3-d figure in which all 6 faces are rectangles

97. reflection (flip) A move that involves flipping a figure over a line

98. regroup Example: 23 = 2 tens 3 ones or 1 ten 13 ones To exchange amounts of equal value to rename a number

99. remainder The number that is left over after dividing

100. rhombus A 2D figure with four equal sides whose opposite sides are parallel

101. right angle A right angle is a special angle. The corners of a sheet of paper are at right angles.

102. round When you round a number to the nearest ten, you find the ten that’s closest Example: 23 20 36 40

103. rotation (turn) A move that involves turning a figure

104. solid figure 3-dimensional figures with edges, faces and/or corners

105. sphere Any round object whose curved surface is the same distance from the center to all its points

106. square A plane figure with 4 equal sides and 4 right angles

107. square pyramid A solid 3-d figure with a base that is a square and four faces that are triangles with a common point

108. standard form A way to write number by using the digits 0-9, with each digit having a place value Example: 2,394

109. subtraction An operation on two or more numbers to find the difference 6 - 2 = 4

110. sum The answer to an addition problem Example: 12 + 7 = 19 The sum is 19

111. symmetry When one half of a figure looks like the mirror image of the other half

112. tally table A way to organize data using tally marks to show how often something happens

113. temperature A measurement of how hot or cold something is

114. tenth One of ten equal parts

115. thermometer An instrument for measuring temperature

116. translation (slide) A move that slides a figure a given distance in a given direction

117. triangle A plane figure with 3 sides and 3 angles

118. triangular prism A 3-d figure (solid) with two identical, triangular bases

119. triangular pyramid A 3-d figure (solid) with a triangular base and triangular faces that come to a point

120. volume The measure of space a solid figure occupies The volume of this figure is 24 cubic units 3 x 2 x 4 = 24

121. width The measurement of an object from side to side

122. whole numbers {0, 1, 2, 3,...} The set of numbers that includes 0 and all natural numbers

123. word form two-hundred fifty-seven A way to write numbers by using words

124. yard (yd) A customary unit used to measure length 1 yard = 3 feet