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Math Vocabulary 3rd grade

3rd grade math vocabulary

Terms

undefined, object
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point
An exact position or location
rounding
One way to estimate
fact family
A set of related multiplication and division, or addition and subtraction problems
mixed number
a number represented by a whole number and a fraction
line of symmetry
A quadrilateral with 2 pairs of parallel sides and 4 equal sides
divide
To separate into equal groups
data
Information collected about people or things
kilometer
A metric unit that is used to measure length and distance; 1,000 meters = 1 kilometer
line graph
A graph that uses a line to show how something changes over time
gallon
A customary unit for measuring capacity; 4 quarts = 1 gallon
isosceles triangle
a triangle with only two equal sides
line segment
A part of a line that extends between two points or endpoints
less than <
A symbol used to compare two numbers, with the lesser number given first
predict
to tell what you think will happen
vertex
In a solid figure, the corner made where three or more edges meet
hexagon
A polygon with six sides and six angles
schedule
A table that lists activities or events and the times they happen
event
Something that happens
likely
Having a good chance of happening
like fractions
fractions that have the same denominator
kilogram
A metric unit that is used to measure mass (large amounts)
noon
12 o'clock in the day
milliter
A metric unit that is used to measure capacity; 1,000 milliliters = 1 liter
square unit
used to measure area
simplest form
the form of a fraction that is modeled with the largest fraction bar possible
vertical bar graph
A bar graph that has bars going from the bottom up
radius
A line segment whose enpoints are the center of acircle and any point on the circle
meter
A metric unit that is used to measure length or distance; 100 centimeters = 1 meter
line plot
A diagram that shows the frequency of data on a number line
P.M.
Between noon and midnight
tessellate
A way to write numbers by using words
quotient
The number, not including the remainder, that results from dividing
quart
A customary unit for measuring capacity; 2 pints = 1 quart
edge
The line segment formed where two faces of a solid figure meet
product
The answer in a multiplication problem
A.M.
Between midnight and noon
factors
The numbers you multiply
denominator
the part of a fraction that tells how many equal parts are in the whole
ray
A part of a line that is straight and extends from one endpoint out in one direction
numerator
the part of a fraction that tells how many parts are being counted
perimeter
The distance around an object or plane figure
midnight
12 o'clock at night
range
The difference between the greatest number and the least number in a set of data
intersecting lines
Lines that cross
hundredth
one of one hundred equal parts
remainder
The amount left over when a number cannot be divided evenly
right angle
A special angle that forms a square corner
unlikely
An event is unlikely if it does not have a good chance of happening.
polygon
A triangle with no equal sides
liter
A metric unit that is used to measure capacity; 1,000 milliliters = 1 liter
line
A straight path extending in both directions with no endpoints
diameter
A line segment that passes through the center of a circle and whose endpoints are on the circle
congruent
Figures that have the same size and shape
bar graph
A graph that uses bars to show data
elapsed time
The amount of time that passes from the start of an activity to the end of that activity
expression
The part of a number sentence that combines numbers and operation signs, but doesn't have an equal sign
fair
every player has and equal chance to win the game
celsius
A unit for measuring temperature in the metric system
greater than >
A symbol used to compare two numbers, with the greater number given first
octagon
a polygon with eight sides and eight angles
classify
To group pieces of data according to how they are the same: size, color, shape
multiply
When groups have the same number, you can mutiply to find how many in all.
outcome
a possible result of an experiment
digits
The symbols 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9
parallel lines
Lines that never cross
impossible
An event is impossible if it will never happen.
center
A point in the middle of a circle that is the same distance from every point on the circle
odd
numbers end in 1, 3, 5, 7, or 9
volume
the amount of space a solid figure takes up
order property of multiplication
a rule stating that you can multiply two factors in any order and get the same product
divisor
The number that divides the dividend
yard
A customary unit used to measure length or distance; 3 feet = 1 yard
survey
A question or set of questions that a group of people are asked
array
An arrangement of objects in rows and columns
gram
A metric unit that is used to measure mass (small amounts)
equal sign =
A symbol used to show that two numbers have the same value
quadrilateral
A quadrilateral whose opposite sides are parallel and equal
equivalent
Two or more sets that have the same value are equivalent.
rhombus
a quadrilateral with 2 pairs of parallel sides and 4 equal sides
estimate
To find about how many or how much
decimeter
A metric unit that is used to measure lenght; 10 centimeters = 1 decimeter
grid
horizonal and vertical lines on a map
calendar
A table that shows the days, weeks, and months of a year
possible outcome
Something that has a chance of happening
scale
The numbers on a bar graph that help you read the number each bar shows
cup (c)
A customary unit used to measure capacithy
certain
An event is certain if it will always happen.
pound
A customary unit used to measure weight; 16 ounces = 1 pound
ounce
A customary unit used to measure weight / 16 or these = 1 pound
pint
A customary unit for measuring capacity; 2 cups = 1 pint
equally likely
Having the same chance of happening
face
A flat surface of a solid figure
equilateral triangle
a triangle in which all three sides are equal
angle
The figure formed when two rays share the same endpoint
results
the answers from a survey
cubic unit
used to measure volume
even
numbers end in 0, 2, 4, 6, or 8
scalene triangle
a triangle with no equal sides
area
The number of square units needed to cover a flat surface
standard form
A way to write numbers by using the digits 0-9, with each digit having a place value
equivalent fractions
two or more fractions that name the same amount
fraction
a number that names part of a whole or part of a set
decimal
a number with one or more digits to the right of the decimal point
fahrenheit
A unit for measuring temperature in the customary system
compare
To describe whether numbers are equal to, less than, or greater than, each other
pentagon
A polygon with five sides and five angles
minute
A minute measures a short amount of time
expanded form
A way to write numbers by showing the value of each digit
dividend
The number that is to be divided in a division problem
right triangle
a triangle in which there is one right angle
frequency table
A table that uses numbers to record date
tally table
A table that uses tally marks to record data
horizontal bar graph
A bar prah that has bars going from left to right
mode
the number that occurs most often in a set of data
mile
A customary unit used to measure distance; 5,280 feet = 1 mile
foot
A customary unit used to measure length or distance; 12 inches = 1 foot
tenth
one of ten equal parts
capacity
The amount a container can hold
centimeter
A metric unit that is used to measure length; 100 centimeters = 1 meter
parallelogram
a quadrilateral whose opposite sides are parallel and equal
benchmark numbers
Numbers that help you estimamte objects without counting them, such as 25, 50, 100

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