# 4th Grade Math Vocabulary 2

## Terms

undefined, object
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a.m
used to show time between midnight and noon
Associative Property of Multiplication
the way that factors are grouped does not change the product
certain
to be sure or definite
cube
a space figure with 6 congruent faces, 8 vertices, and 12 equal edges
decimal number
a number containing a decimal point
difference
the answer to a subtraction problem
endpoint
a point at the end of a line segment or ray
face
a flat surface on a space figure
front-end digit
the digit in the place with the greatest value
hexagon
a polygon with 6 sides and 6 vertices
inverse operations
2 operations with the opposite effect like multiplication and division
line graph
a graph used to show how data changes over time
median
the middle number when numbers are arranged from least to greatest
mirror image
the reverse image of a figure
numerator
the top number in a fractio; how many equal parts are being considered
ounce (oz)
a customary unit of mass
period
a group of 3 digits in a number separated by a comma from the other digits
plane figure
any 2-dimensional figure
product
the answer to a multiplication problem
quotient
the answer to a division problem
remainder
the number that is left after dividing
space figure
a figure with 3 dimensions
teaspoon (tsp)
a customary unit of capacity
trapezoid
a quadrilateral with 1 pair of parallel sides and 1 pair of sides that are not parallel
whole number
any of the counting numbers 0, 1, 2, 3, 4, 5, 6, 7⬦.
acute angle
an angle less than a right angle
average
circle
a closed plane figure with all the points the same distance from center
cup, c
a customary unit of capacity
decimal point
a dot separating the ones and tenths places in a decimal number
digit
the symbols 0 to 9 used to write numbers
equally likely
outcomes having the same chance of happening
fact family
all related +/- or x/- facts that use the same numbers
front-end estimation
an estimation made using the front-end digit of a number
hundredths
the name of the second place after the decimal point
kilogram (kg)
a metric unit of mass
line of symmetry
a line on which a figure can be folded so that both halves are congruent
meter
a metric unit of length/distance
mixed number
a number written as a whole number and a fraction
obtuse angle
an angle greater than a right angle
outcome
a result of a probability experiment
perpendicular
2 lines that intersect and form right angles
plot
using an ordered pair to locate a point on a grid
Property of 1 for Division
any number divided by 1 is that number
range
the difference between the greatest number and the least number in a set of numbers
right angle
an angle with the shape of a square corner
sphere
a three-dimesional figure with a curved surface that is shaped like a ball
tenths
the name of the first place after the decimal point
turn (rotation)
a transformation of a figure by turning it
word form
a number written in words
bar graph
a graph that uses bars to compare data
closed figure
a plan figure that completely surrounds an area
customary system
a system of measurement used in the U.S.
decimeter (dm)
a metric unit of length
dividend
the number to be divided
equivalent decimals
2 decimals that are equal
factors
numbers that are multiplied to give a product
gallon (gal)
a customary unit of capacity
impossible
cannot happen
kilometer (km)
a metric unit of length
line segment
a part of a line with 2 endpoints
metric system
a measurement system based on tens
most likely
outcomes that have a greater chance of happening
octagon
a polygon with 8 sides and 8 vertices
p.m.
used to show the time between noon and midnight
pictograph
a graph that uses pictures or symbols to show data
point
any exact location in space represented by a dot
Property of 1 for Multiplication
the product of any number and 1 is that number
ratio
a comparison of two numbers
rotation
a transformation of a figure by turning it about a fixed point
sum
three-dimensional (3-D) figures
space figures that have length width and height
two-dimensional figures (2-D)
plane figures that have length and width
yard (yd)
a customary unit of length
angle
the figure made by 2 rays that extend from a common endpoint
capacity
the amount a container can hold
Commutative Property of Multiplication
the order in which numbers are multiplied does not change the product
cylinder
a space figure with 2 circular faces that are parallel and congruent
degree Celsius ( C)
a metric unit used to measure temperature
divisor
the number by which a number is divided
equivalent fractions
2 fractions that are equal
fraction
a number that names parts of a whole
gram (g)
a metric unit of mass
improper fraction
a fraction with a value greater than 1, the numerator is greater than or equal to the demonimator
least likely
outcomes that have a smaller chance of happening
liter (L)
a metric unit of capacity
milliliter (mL)
a metric unit of capacity
multiple
the product of a whole number and any other whole number
open figure
a plane figure that does not completely enclose an area
parallel
lines that are the same distance apart and do not intersect
pint (pt)
a customary unit of capacity
polygon
a closed plane figure made with line segments
pyramid
a space figure whose base is a polygon, and other faces are triangles that meet at a vertex
ray
a part of a line that has 1 endpoint and goes on and on in one direction
round
to estimate a number to the nearest ten, hundred, or thousand
square pyramid
a space figure with a square base and 4 faces that are triangles and meet in a vertex.
ton (t)
a customary unit of weight
Venn diagram
a diagram that uses intersecting circles to compare groups of objects
Zero Property of Division
0 divided by any number except 0 is 0. A number cannot be divided by zero.
area
the measure, in square units, of the inside of a plane figure
centimeter (cm)
a metric unit of length
cone
a space figure with 1 curved surface, 1 flat face, 1 curved edge, and 1 vertex
data
a collection of facts gathered by observation, questioning, or measuring
degree ( F)
a customary unit used to measure temperature
edge
the line where 2 faces of a space figure meet
estimate
an approximate rather than an exact answer
flip (reflection)
a transformation that results in a mirror image of a figure
graph
a drawing used to record information
inch (in.)
a customary unit of length
less than (<)
the symbol used to compare 2 numbers when the smaller number is on the left
mass
the weight of an object; the amount of matter in an object
millimeter (mm)
a metric unit of length
number line
a line on which points correspond to numbers
ordered pair
a pair of numbers used to name a location on a grid
pentagon
a polygon with 5 sides and 5 vertices
place value
the value determined by the position of a digit in a number
pound (lb)
a customary unit of mass
a 4-sided polygon
rectangular prism
a space figure with 6 rectangular faces, 8 vertices, and 12 edges
side
a line segment that is part of a plane figure
standard form
a number written with one digit for each place value
transformation
an operation on a geometric figure by which another image is created
vertex/vertices
the point or points where 2 or more line segments meet; the "corner"
Zero Property of Multiplication
the product of any number and 0 is 0.
array
an arrangement of objects in rows and columns
century
100 years
congruent
figures that have the same size and shape
10 years
denominator
the bottom number in a fraction; the number of equal parts
elapsed time
the amount of time between 2 given times
expanded form
a way to write numbers that shows the value of each digit
foot (ft)
a customary unit of length
greater than (>)
the symbol used to compare 2 numbers when the larger one is on the left
intersecting lines
lines that cross at one point
line
a straight path that goes on and on in 2 directions with no endpoints
mean
the average of a set of numbers
mode
the number that appears most often in a set of numbers
number sentence
an equation or inequality written with numbers and symbols
ordinal number
a number telling the position of something
perimeter
the distance around a figure
plane
a flat surface that goes on and on in all directions
probability
the chance of something happening
quart (qt)
a customary unit of capacity
reflection
a transformation that results in a mirror image
slide (translation)
a transformation that moves a figure by slidings each of the points the same distance and direction
tablespoon (tbsp)
a customary unit of capacity
translation
a transformation that moves a figure by slidings each of the points the same distance and direction
volume
the number of cubic units that fit inside a space figure

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