1. Mathematical Vocabulary
Lionville Elementary School

2. Why Math Word of the Week?
Words taken from PDE Math Glossary
Words intended for grades 3-5
It is assumed that Grade 5 students mastered Grades 3 & 4 vocabulary
It is assumed that Grade 4 students mastered Grade 3 vocabulary
Words will be included in PSSA
Understanding words will improve our students’ ability to problem solve
Words are critical for mathematical development

3. any number that is being added
Grade 3 Math Vocabulary
Addend-
any number that is being added

4. the measure, in square units, of the inside of a plane figure
Grade 3 Math Vocabulary
Area-
the measure, in square units, of the inside of a plane figure

5. a rectangular arrangement of objects in equal rows or columns
Grade 3 Math Vocabulary
Array-
a rectangular arrangement of objects in equal rows or columns

6. Associative Property-
Grade 3 Math Vocabulary
Associative Property-
add or multiply no matter how the numbers are grouped

7. Grade 3 Math Vocabulary
Average/Mean-
the sum of a list of numbers divided by the number of numbers in the list

8. display of data using bars of different heights
Grade 3 Math Vocabulary
Bar Graph-
display of data using bars of different heights

9. Commutative Property-
Grade 3 Math Vocabulary
Commutative Property-
changing the order of the addends or factors does not change the answer

10. the number below the line in a common fraction; a divisor
Grade 3 Math Vocabulary
Denominator-
the number below the line in a common fraction; a divisor

11. a statement that two mathematical expressions are equal
Grade 3 Math Vocabulary
Equation-
a statement that two mathematical expressions are equal

12. Grade 3 Math Vocabulary
Equivalent-
having the same value

13. a plane figure that serves as one side of a solid figure
Grade 3 Math Vocabulary
Face-
a plane figure that serves as one side of a solid figure

14. Grade 3 Math Vocabulary
Factor-
a whole number that divides evenly into another whole number (e.g. 1, 3, 5, and 15 are factors of 15

15. represents a part of a whole
Grade 3 Math Vocabulary
Fraction-
represents a part of a whole

16. a straight path extending in both directions with no endpoints
Grade 3 Math Vocabulary
Line-
a straight path extending in both directions with no endpoints

17. a graph showing the frequency of data on a number line
Grade 3 Math Vocabulary
Line Plot-
a graph showing the frequency of data on a number line

18. Grade 3 Math Vocabulary
Number Line-
a straight line with a "zero" point in the middle, with positive and negative numbers listed on either side of zero and going on indefinitely.

19. an equation or inequality with numbers
Grade 3 Math Vocabulary
Number Sentence-
an equation or inequality with numbers

20. the top number in a fraction which shows how many parts we have
Grade 3 Math Vocabulary
Numerator-
the top number in a fraction which shows how many parts we have

21. the rules that say which calculation comes first in an expression
Grade 3 Math Vocabulary
Order of Operations-
the rules that say which calculation comes first in an expression

22. Grade 3 Math Vocabulary
Pentagon-
a polygon with 5 sides

23. the distance around a figure
Grade 3 Math Vocabulary
Perimeter-
the distance around a figure

24. a graph that uses pictures to show and compare information
Grade 3 Math Vocabulary
Pictograph-
a graph that uses pictures to show and compare information

25. the value of where the digit is in the number
Grade 3 Math Vocabulary
Place Value-
the value of where the digit is in the number

26. a flat surface that extends infinitely in all directions
Grade 3 Math Vocabulary
Plane-
a flat surface that extends infinitely in all directions

27. a closed plane figure having three or more sides
Grade 3 Math Vocabulary
Polygon-
a closed plane figure having three or more sides

28. the answer of a multiplication problem
Grade 3 Math Vocabulary
Product-
the answer of a multiplication problem

29. Grade 3 Math Vocabulary
Quadrilateral-
a four-sided polygon

30. the answer in a division problem
Grade 3 Math Vocabulary
Quotient-
the answer in a division problem

31. a parallelogram with four equal sides
Grade 3 Math Vocabulary
Rhombus-
a parallelogram with four equal sides

32. the answer in an addition problem (the total)
Grade 3 Math Vocabulary
Sum-
the answer in an addition problem (the total)

33. a table that uses tally marks to record data
Grade 3 Math Vocabulary
Tally Chart-
a table that uses tally marks to record data

34. Grade 3 Math Vocabulary
Time (analog & digital)- a point of time as measured in hours and minutes past midnight or noon

35. a square whose sides have length 1
Grade 3 Math Vocabulary
Unit Square-
a square whose sides have length 1

36. the amount of space (in cubic units) that a solid figure can hold
Grade 3 Math Vocabulary
Volume-
the amount of space (in cubic units) that a solid figure can hold

37. Grade 3 Math Vocabulary
Whole Number-
whole numbers are positive numbers, including zero, without any decimal or fractional parts

38. an angle with a measure less than 90 degrees
Grade 4 Math Vocabulary
Acute Angle-
an angle with a measure less than 90 degrees

39. a triangle with all three angles acute (less than 90°)
Grade 4 Math Vocabulary
Acute Triangle-
a triangle with all three angles acute (less than 90°)

40. two angles that have a common vertex and a common side
Grade 4 Math Vocabulary
Adjacent Angles-
two angles that have a common vertex and a common side

41. the figure formed by two rays
Grade 4 Math Vocabulary
Angle-
the figure formed by two rays

42. a whole number having more than two factors
Grade 4 Math Vocabulary
Composite Number-
a whole number having more than two factors

43. Grade 4 Math Vocabulary
Decagon-
10-sided polygon

44. Grade 4 Math Vocabulary
Decimal Notation- representation of a fraction or other real number using the base ten and consisting of any of the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, and a decimal point

45. Grade 4 Math Vocabulary
Degree (angle)-
a measure for angles

46. Degree (temperature)-
Grade 4 Math Vocabulary
Degree (temperature)-
a measure of temperature (how hot or cold it is) The symbol for degrees is °

47. a number by which another number is to be divided
Grade 4 Math Vocabulary
Divisor-
a number by which another number is to be divided

48. Equilateral Triangle- triangle in which all three sides are equal
Grade 4 Math Vocabulary
Equilateral Triangle-
triangle in which all three sides are equal

49. Expanded Form (Expanded Notation)-
Grade 4 Math Vocabulary
Expanded Form (Expanded Notation)-
a way to write numbers that shows the value of each digit (e.g., 4,372 = or 10 x 10 x 10=103)

50. Grade 4 Math Vocabulary
Factor Pair-
a set of two numbers, which when multiplied result in a definite number

51. Grade 4 Math Vocabulary
Function-
a special relationship between numbers where each input has a single output

52. Grade 4 Math Vocabulary
Heptagon-
a polygon with 7 sides

53. Grade 4 Math Vocabulary
Hexagon-
a polygon with 6 sides

54. a whole number; a number that is not a fraction
Grade 4 Math Vocabulary
Integer-
a whole number; a number that is not a fraction

55. two sides of equal length
Grade 4 Math Vocabulary
Isosceles Triangle-
two sides of equal length

56. Least Common Denominator-
Grade 4 Math Vocabulary
Least Common Denominator-
he least common multiple of the denominators in two or more fractions

57. either of the two sides that form an angle in a triangle
Grade 4 Math Vocabulary
Leg (of triangles)-
either of the two sides that form an angle in a triangle

58. Grade 4 Math Vocabulary
Line of Symmetry-
a line that divides a figure into two halves that are mirror images of each other

59. a part of a line with two endpoints
Grade 4 Math Vocabulary
Line Segment-
a part of a line with two endpoints

60. Grade 4 Math Vocabulary
Multiple-
the product of a given whole number and another whole number (e.g., multiples of 4 are 4, 8, 12, )

61. Grade 4 Math Vocabulary
Nonagon-
a polygon with 9 sides

62. an angle with a measure more than 90 degrees
Grade 4 Math Vocabulary
Obtuse Angle-
an angle with a measure more than 90 degrees

63. Grade 4 Math Vocabulary
Octagon-
a polygon with 8 sides

64. two lines, segments, or rays that intersect to form right angles
Grade 4 Math Vocabulary
Perpendicular-
two lines, segments, or rays that intersect to form right angles

65. Grade 4 Math Vocabulary
Point-
A point or dot used to separate the whole number part from the fractional part of a number

66. Grade 4 Math Vocabulary
Prime Number- a whole number that has exactly two factors, 1 and itself

67. Grade 4 Math Vocabulary
Ray-
a part of a line that has one endpoint and continues without end in one direction

68. a polygon that has all sides congruent and all angles congruent
Grade 4 Math Vocabulary
Regular Polygon-
a polygon that has all sides congruent and all angles congruent

69. a triangle that has a 90 degree angle
Grade 4 Math Vocabulary
Right Triangle-
a triangle that has a 90 degree angle

70. Grade 4 Math Vocabulary
Scalene Triangle-
three unequal sides

71. the second number in a subtraction sentence
Grade 4 Math Vocabulary
Subtrahend-
the second number in a subtraction sentence

72. the price of a single item or amount (e.g., $3.50 per pound)
Grade 4 Math Vocabulary
Unit Price-
the price of a single item or amount (e.g., $3.50 per pound)

73. a diagram that shows relationships among sets of objects
Grade 4 Math Vocabulary
Venn Diagram-
a diagram that shows relationships among sets of objects

74. Grade 4 Math Vocabulary
Vertex-
a point where lines, rays, sides of a polygon or edges of a polyhedron meet (corner)

75. Grade 5 Math Vocabulary
Axis-
the horizontal number line (x-axis) and the vertical number line (y-axis) on the coordinate plane

76. the plane determined by a horizontal number line
Grade 5 Math Vocabulary
Coordinate Grid-
the plane determined by a horizontal number line

77. Grade 5 Math Vocabulary
Coordinate Plane-
the plane determined by a horizontal number line, called the x-axis, and a vertical number line, called the y-axis, intersecting at a point called the origin

78. Grade 5 Math Vocabulary
Diameter-
a line segment that has endpoints on a circle and passes through the center of the circle

79. the line where two surfaces meet
Grade 5 Math Vocabulary
Edge-
the line where two surfaces meet

80. Numerical Expression-
Grade 5 Math Vocabulary
Numerical Expression-
a mathematical phrase involving only numbers and one or more operational symbols

81. a triangle that has an angle greater than 90°
Grade 5 Math Vocabulary
Obtuse Triangle-
a triangle that has an angle greater than 90°

82. Grade 5 Math Vocabulary
Ordered Pair-
a pair of numbers used to locate a point on a coordinate grid; the first number tells how far to move horizontally, and the second number tells how far to move vertically

83. Grade 5 Math Vocabulary
Origin-
the point on the coordinate plane where the x-axis and y-axis intersect (0,0)

84. Grade 5 Math Vocabulary
Parallelogram- a quadrilateral whose opposite sides are parallel and congruent

85. a solid object with two identical ends and flat sides
Grade 5 Math Vocabulary
Prism-
a solid object with two identical ends and flat sides

86. the four regions of a coordinate plane that are separated by the axes
Grade 5 Math Vocabulary
Quadrant-
the four regions of a coordinate plane that are separated by the axes

87. Grade 5 Math Vocabulary
Radius-
a line segment that has one endpoint on a circle and the other endpoint at the center of the circle

88. a solid figure in which all six faces are rectangles
Grade 5 Math Vocabulary
Rectangular Prism-
a solid figure in which all six faces are rectangles

89. the line on a graph that runs horizontally (left- right)
Grade 5 Math Vocabulary
X-axis-
the line on a graph that runs horizontally (left- right)

90. the line on a graph that runs vertically (up- down)
Grade 5 Math Vocabulary
Y-axis-
the line on a graph that runs vertically (up- down)