80 terms

# 4th grade math vocabulary review

#### Terms in this set (...)

acute triangle
A triangle that contains only angles that are less than 90 degrees.
area
the measure of how many square units it takes to cover a two-dimensional shape exactly
array
an arrangement of objects in rows and columns
bar graph
the use of bars of different lengths to display data
capacity/volume
the measure of how much a container can hold when it is full
certain
describes an event that will always occur
commutative property
the order of the addends in addition or the factors in multiplication does not change the sum or product
composite number
a number that has more than two factors
congruent
having the same shape and size
customary units
units used in the measurement of capacity (cups, pints, quarts, gallons), length (inches, feet, yards, miles), and weight (ounces, pounds, tons)
decimal
a number with one or more digits to the right of the decimal point
decimal point
a period used in decimal numbers to separate the whole number from the part that shows tenths, hundredths, etc...
edge
a line segment where two faces meet
equation
a number sentence with an equal sign
equilateral triangle
a triangle with three equal sides
equivalent fractions
fractions that name the same amount;example 1/3 and 2/6
estimate
round numbers where an exact answer is not necessary
expanded form (notation)
a way to write numbers by showing the value of each digit
face
a flat surface of a three-dimensional object
fact family
a group of related facts that use the same numbers
factors
numbers that can divide another number evenly
favorable outcome
the outcome you are looking for in an experiment
fraction
a number that names part of a whole or part of a group
front-end estimation
estimating by using only the value of the digit that is farthest to the left of the number
impossible
when an event will never occur
inequality
a number sentence that uses the symbols greater than and less than
intersecting lines
lines that go through the same point
isosceles triangle
a triangle with two equal sides
likely
describes an event that will happen more than half the time
line
a straight path of points that goes on forever in two directions (arrow on each end)
line graph
a graph that shows how data changes over time
line plot
organization of data by showing it along a number line
line segment
a part of a line that has two endpoints
median
the middle number in a set of data arranged in numerical order (least to greatest)
mixed number
a number that has both a whole number and a fraction
mode
the number that occurs the most often in a set of data
multiple
the product of a given whole number and another number
numerator
the top number in a fraction that tells how many parts of a whole or group are being named
obtuse triangle
a triangle that contains an angle of more than 90 degrees
ordered pairs
numbers used to find the location of a point on a coordinate grid
parallel lines
lines that are always the same distance apart
parallelogram
a quadrilateral in which opposite sides are parallel and of equal length
perimeter
the measure of the edge all the way around a two-dimensional shape
perpendicular lines
lines that intersect to form four right angles
place-value chart
a chart that shows the places and the place values of the digits in a number
plane
a flat surface extending without end in all directions
point
a location in space
prime number
a number that has exactly two factors, the number itself and 1
probability
a way of describing how likely it is that an event will happen
a polygon that has four sides and four vertices
quotient
the answer in a division problem
range
the difference between the greatest number and the least number in a set of data
rectangle
a quadrilateral with four right angles and two pairs of parallel sides
reflection
the movement of a figure by flipping it over a line creating a mirror image
regroup
the renaming of a number such as 10 ones regrouped as 1 ten and 0 ones, to assist in addition or subtraction (borrowing and carrying)
related facts
facts that are in the same fact family
remainder
the amount left over when a whole number cannot be divided evenly
rhombus
a quadrilateral with four sides of equal length in which opposite sides are parallel
right triangle
a triangle that includes a right angle
rotation
turning a figure around a point
rotational symmetry
when a figure can be rotated onto itself after a rotation of less than a complete circle
round
a way to estimate a number to the nearest ten, hundred, and so on
scale
numbers on the side or bottom of a graph that tells what each bar or point stands for
scalene triangle
a triangle with side measures of three different lengths
square
a quadrilateral with four equal sides and four right angles
standard form
a number written with one digit for each place value
survey
three-dimensional
objects that take up space
translation
the movement of a figure by sliding it
trapezoid
a quadrilateral with one pair of parallel sides
two-dimensional
flat figures that are sometimes called plane figures
unlikely
describes an event that will happen less than half the time
variable
a letter or symbol that represents an unknown number
Venn diagram
a graph that uses overlapping circles to represent how data groups are alike or different
vertex (plural vertices)
a point where three or more edges meet
volume
the number of cubic units that will fit into a three-dimensional object
denominator
the bottom number of a fraction telling how many parts a whole is divided into
a fraction smaller than one
the numerator is less than the denominator
a fraction equal to a whole
the numerator and denominator are equal
improper fraction
the numerator is greater than the denominator - a fraction greater than a whole