# Math Vocabulary 3rd grade

3rd grade math vocabulary

## Terms

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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