Math Vocabulary List



Math Vocabulary List

#1-10

Sum: the total or whole amount. Addend + Addend = Sum

Difference: difference between two numbers.

Associative property of addition: in addition, no matter how the numbers are grouped, the answer will always be the same.

Commutative property of addition: in addition, numbers may be added together in any order.

Identity of property of addition: when zero is added to a number the result is the number itself.

Distributive property of addition: the sum of two numbers times a third number is equal to the sum of each addend times the third number.

Expanded form: a way of writing numbers to show place value.

Word form: writing numbers using words.

Equal sign: used to show equivalence.

Value: numerical worth or amount.

#11-20

Equation: mathematical statement containing an equal sign, to show that two expressions are equal.

Operations: there are four basic operations in arithmetic used to solve problems. They are addition, subtraction, multiplication, and division.

Regroup: used to assist when trading or carrying in addition and subtraction.

Inverse operation: opposite, reverse operations. Addition and subtraction are inverse operations. Multiplication and division are inverse operations.

Product: the result when two numbers are multiplied.

Quotient: the number resulting from dividing one number by another.

Factor: a whole number that divides exactly into another number or a whole number that multiplies with another number to make a third number.

Multiple: a mathematical operation where a number is added to itself a number of times.

Zero property of multiplication: the product of zero and any number is zero.

Associative property of multiplication: the way factors are grouped does not change a product.

21-30

Commutative property of multiplication: when two numbers are multiplied together, the product is the same regardless of the order of the factors.

Identity property of multiplication: when a number is multiplied by 1 the result is the number itself.

Distributive property of multiplication: multiplying a number is the same as multiplying its addends by the number, then adding the products.

Stem and leaf plot: a data display that shows groups of data arranged by place value.

Mean: average of a number of different amounts. Add up all the amounts then divide your total by how many amounts there were.

Median: the middle value of an ordered set of values.

Mode: in a set of scores, the mode is the score that occurs the most.

Range: subtract the highest and the lowest values to find the range of the set of numbers.

Convert: changing from one unit of measure to another.

Number expression: mathematical sentence written in numerals and mathematical symbols.

#31-40

31. Transformation: a change in position or size.

32. Rotation: to turn an object.

33. Reflection: to flip an object.

34. Translation: to slide an object.

35. Similar: having the same shape but not necessarily the same size.

36. Congruent: having the same shape and the same size.

37. Net: flat shape which can be folded up into a three dimensional solid.

38. Benchmark numbers: a number used to estimate the size of other numbers. 0, ½, 1

39. Line: a long, thin mark that goes on forever in both directions.

40. Line segment: section of a line with two endpoints.

#41-50

41. Angle: to rays meeting at a common point.

42. Ray: line that has a starting point but no endpoint.

43. Parallel lines: lines exactly the same distance apart and never touch.

44. Perpendicular lines: lines that intersect at right angles to each other.

45. Intersecting lines: cross over one another at a point.

46. Horizontal lines: lines that run left and right.

47. Vertical lines: lines that run up and down.

48. Lines of symmetry: lines that divide objects in half so each side exactly mirrors the other.

49. Coordinate grid: a plane containing an x axis and y axis.

50. Ordered pairs: a point on a coordinate grid. (x,y)

#51 - 60

51. Equivalent: having the same value or amount.

52. Numerator: number above the line of a fraction, represents the part of the whole.

53. Denominator: bottom number in a fraction, represents the whole.

54. Decimal: fraction of a number.

55. Area: the size a surface takes up.

56. Perimeter: distance around the outside of a shape.

57. Estimate: rounding a number.

58. Justify: to prove what you say and do is right.

59. Diagram: representation of information.

60. Variable: a letter or symbol representing a varying quantity.

# 61 - 70

61. Accurate: to find a solution without error

62. Chart: visual representation of data

63. Coordinate grid: a plane containing an x axis and y axis

64. Data: Factual information, especially information organized used to reason or make decisions.

65. Equation: a mathematical statement that two expressions are equal

66. Estimate: To calculate approximately

67. Expand: To write as a sum of terms in an extended form

68. Factor: One of two or more quantities that divides a given quantity without a remainder

69. Identity of property of addition: when zero is added to a number the result is the number itself.

70. Justify: to show an solution to be reasonable

71. Label: To identify

72. Mode: in a set of scores, the mode is the score that occurs the most

73. Range: subtract the highest and the lowest values to find the range of the set of numbers

74. Sum: the total or whole amount

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