Math Vocabulary Grade 5

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2-dimensional (2-D)
having area but not volume
3-dimensional (3-D)
having length, width, and thickness
Accurate
as correct as possible for the situation
acute angle
an angle with a measure less than 90 degrees
acute triangle
a triangle with three acute angles
algebra
the branch of mathematics that uses letters and other symbols to stand for quantities that are unknown or vary
algebraic expression
an expression that contains a variable
algorithm
a set of a step by step instructions for doing something, such as solving a problem
angle
a figure that is formed by 2 rays or line segments with a common end point
approximate
close to exact
area
the amount of surface inside a 2-dimensional shape
area model
a model for multiplication problems in which the length and width of a rectangle represent the factors, and the area of the rectangle represents the product
array
an arrangement of objects in a regular pattern, usually in rows and columns
axis of coordinate grid
either of the two number lines that intersect to form a coordinate grid
bar graph
a graph that uses horizontal or vertical bars to represent data
base
the side of a polygon or face of a polyhedron from which the height is measured
base (in exponential notation)
the number that is raised to a power.
capacity
the amount a container can hold
category
a group members are defined by a shared attribute
circle
a 2-dimensional, closed, curved path whose points are all the same distance from a center point
common denominator
for two or more fractions, a number that is a multiple of both or all denominators
congruent figures
figures that have the same shape and the same size
conjecture
a statement that is thought to be true based on information or mathematical thinking
coordinate
one of two numbers in an ordered pair. The number pair is used to locate a point on a coordinate grid
cube
a polyhedron with six square faces, eight vertices, and 12 edges
cubic unit
a unit used in measuring volume
cup
a U.S. customary unit of volume or capacity equal to eight fluid ounces or 1/2 pint
data
information that is gathered by counting, measuring, questioning, or observing
decimal
a number written in standard, base-10 notation that contains a decimal point, such as 2.54
decimal point
a dot used to separate the ones and tenths in decimals
degree
a unit of measure for angles based on dividing a circle into 360 equal parts
denominator
the number below the line in a fraction
difference
the result of subtracting one number from another
digit
one of the number symbols 0,1,2,3,4,5,6,7,8, and 9 in the standard, base-ten system
dividend
the number in division that is being divided.
divisor
in division, the number that divides another number.
edge
any side of a polyhedron's faces
equation
a number sentence that contains an equal sign
equilateral polygon
a polygon in which all sides are the same length
equilateral triangle
a triangle with all three sides equal in length
equivalent
equal in value but possibly in different form
equivalent fractions
fractions that name the same number.
equivalent names
different ways to name the same number
equivalent problem
a division problem solved by writing an equivalent expression
estimate
an answer close to an exact answer
evaluate a numerical expression
to carry out the operations in a numerical expression to find a single value for the expression
even number
a counting number that can be divided by 2 with no remainder
expanded form
a way of writing a number as the sum of the values of each digit
exponent
a number used in exponential notation to tell how many times the base is used as a factor
exponential notation
a way to show repeated multiplication by the same factor
expression
a group mathematical symbols that represents a number --or can represent a number if values are assigned to any variables in the expression.
face
a flat surface on a 3-dimensional shape
factor
whenever two or more numbers are multiplied to give a product, each of the numbers that is multiplied is called a factor
factor pair
two factors of a counting number whose product is the number. a number may have more than on factor pair.
formula
a general rule for finding the value of something. Often written using letters, called variables, which stands for quantities involved
fraction
a number in the form a/b. Can be used to name part of a whole or part of a collection.
grouping symbols
symbols such as parenthesis ( ), brackets [ ], and braces { }, that tell the order of operations in an expression are to be done
height
the length of the shortest line segment connecting a vertex of a shape to the line containing the base opposite it
hierarchy of shapes
a way to organize shapes into categories and subcategories. All attributes for a category are attributes of each of its sub categories.
horizontal
in a left to right orientation lined up with the horizon
inequality
a number sentence with <, >, less than or equal to, greater than or equal to, or not equal to
interior of a figure
the inside of a closed figure
intersect
to meet or cross
isosceles triangle
a triangle with at least two side of the same length
kilogram
a metric unit of mass equal to 1,000 grams
kite
a quadrilateral with two pairs of adjacent, equal-length sides.
least common denominator (LCD)
the least common multiple of the denominators of every fraction in a given collection
length
the distance between two points along a path
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