Third Grade

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Math Vocabulary Words
Third Grade by Serena Georges
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2-dimensional figure
Plane figures that have length and width
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3-dimensional figure
3-dimensional figures with edges, faces and/or corners
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addend 2 3 5 The addends are 2 and 3.
A number that is added to another in an addition problem
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addition 3 2 5
The process of finding the total number of items when two or more groups of items are joined
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analog clock
A clock with numbers 1 through 12 around the face with rotating hands to show hours, minutes and seconds
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area area 9 square units
The number of square units needed to cover a surface
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array 3 x 4 12
An arrangement that shows objects in rows and columns
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attribute
Characteristics, size, shape and/or color
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bar graph
A graph that uses bars to show data
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capacity
The amount a container can hold when filled
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centimeter 100 centimeters 1 meter
A metric unit for measuring length
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circle
A closed 2D shape that is perfectly round
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closed figure
A figure that begins and ends at the same point
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cone
A solid 3-d pointed figure that has a flat, round base with an apex
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congruent figures
Figures that have the same size and shape
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corner vertex vertices
The place where two or more edges meet
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cube
A solid figure with six congruent square faces and twelve vertices (corners)
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cubic units
The volume of this figure is 24 cubic units 3
x 2 x 4 24
A standard unit for measuring volume
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cup Example 2 cups 1 pint
A customary unit used to measure capacity
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cylinder
A solid 3-d figure that is shaped like a can
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decimal Examples 0.5 five tenths 0.25 twenty-five hundredths
A number with one or more digits to the right of the decimal point
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decimal point
A symbol used to separate dollars from cents in money and to separate the ones place from the tenths place in decimals
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degree
A unit for measuring temperature
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degree Celsius (C)
A metric unit for measuring temperature
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degree Fahrenheit (F)
A customary unit for measuring temperature
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denominator
The number below the bar in a fraction. It tells the total number of equal parts or groups into which the whole
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difference Example 8 - 3 55 is the difference
The answer in a subtraction problem
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digit 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
Any one of the ten symbols 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9 used to write numbers
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digital clock
A clock that uses numerals only to tell the time
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divide 6 divided by 3 2
To separate into equal groups
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dividend    35 5 7 The dividend is 35.
The number that is to be divided
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divisor 18 3 6       The divisor is 3.
The number that divides the dividend
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elapsed time
From 300 p.m. to 400 p.m. the elapsed time is
one hour.
The amount of time that passes from the start of an activity to the end of that activity
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edge
The line segment where two faces of a solid figure meet
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equal to 45 45
Sign used to show numbers with the same value
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equally likely It is equally likely to pull a circle and a square because they have equal amounts
Outcomes that have the same chance of happening
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equivalent fractions
Two or more fractions that name the same amount
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estimate

• Example
• 23 20
• 40
• About 60

To use rounding to find out about how many
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even number 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20. . .
A whole number that has 0, 2, 4, 6, or 8 in the ones place
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expanded form 241 200 40 1
A way to write numbers by showing the value of each digit
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face
A flat surface of a 3-d figure
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fact family
Examples 2 4 6       6 - 4 24 2 6
      6 - 2 4 or 3 X 6 18       18 6 36
X 3 18       18 3 6
Related facts using the same numbers
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factors 3 x 8 24 The factors are 3 and 8
The numbers that are multiplied to give a product
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fraction
A number that names part of a whole (region) or part of a group
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foot (ft)
A customary unit used to measure length. 1 foot 12 inches
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gallon
A customary unit used to measure capacity 4 quarts 1 gallon
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gram (g) A paper clip has a mass of about 1 gram.
A metric unit used to measure mass
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greater than 64 56
Sign used to compare numbers
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hexagon
A polygon with 6 sides and 6 angles
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heptagon
A polygon with 7 straight sides and 7 angles
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inch
A customary unit used to measure length 12 inches 1 foot
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kilogram (kg)
A metric unit used to measure mass 1,000 grams (g) 1 kilogram (kg)
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kilometer (km)
A unit used to measure distance 1 km 1,000 meters (m)
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length
The distance of an object measured from one end to the other
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least likely It is least likely to pull a triangle
An event that has a lesser chance of happening
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less than 56 64
Sign used to compare numbers
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line segment
Part of a line with two endpoints
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line symmetry
A line that divided a figure into two congruent parts
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liter (L)
A metric unit that is used to measure capacity
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meter (m)
A metric unit used to measure length or distance
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measurement
The act of measuring to determine the size of something
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mile (mi)
A customary unit used to measure length or distance
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milliliter (ml) A small spoon holds about 5 milliliters.
A metric unit used to measure capacity 1,000 milliliter (ml) 1 liter (L)
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millimeter (mm)
A unit of length 10 millimeter (mm) 1 centimeter (cm)
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minutes
Minutes measure short amount of time. There are 60 minutes in one hour.
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minute hand
The long hand on a clock
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most likely It is most likely to pull a square because there are more squares than circles
An event that has a greater chance of happening
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multiplication 3 x 4 12
An operation using repeated addition with two or more numbers
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number line
A line with equally spaced ticks and numbers
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numeral 45 23 67 18 98
A symbol that stands for a number
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numerator
The number above the fraction bar in a fraction. Tells how many equal parts.
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open figure
A figure that does not begin and end at the same point
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ordered pair
A pair of numbers used to locate a point on a grid. The first number tells the left-right position and the second number tells the up-down position
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octagon
A polygon with 8 sides and 8 angles
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odd number
Example
1, 3, 5, 7, 9, 11, 13, 15, 17, 19, . .
A whole number that has 1, 3, 5, 7 or 9 in the ones place
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ounce An ounce of gold
A customer unit used to measure weight
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ordinal number
A number telling order or position
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parallel lines
Example
Lines that never cross and are always the same distance apart
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parallelogram
A plane figure with 2 pairs of parallel sides, 2 pairs of equal angles and 2 pairs of equal sides
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pattern
Repeated design or number sequence
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pentagon
A polygon with 5 sides and 5 angles
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perimeter
2 cm 3 cm 3 cm 8 cmThe perimeter of this
figure is 8 cm.
The distance around a figure
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pictograph
A graph that uses pictures to show and compare information
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pint
A customary unit used to measure capacity 2 cups 1 pint
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place value Hundreds Tens Ones 4 5 0 The value of the 5 is 50 or 5 tens.
The value of a digit depending on its place in number
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plane figure
A figure in a plane that is formed by lines that are curved, straight or both
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polygon
A closed plane figure with straight sides
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pound
A customary unit used to measure weight
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point ?
A position on a number line or in space
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product
6 X 2 12 The product is 12
The answer to a multiplication problem
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quadrilateral
A polygon with 4 angles and 4 sides
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quart
A customary unit used to measure capacity 2 pints 1 quart
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quotient
35 5 7       The quotient is 7
The answer in a division problem
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rectangle
A plane figure with 4 sides and 4 right angles
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rectangular prism
A solid 3-d figure in which all 6 faces are rectangles
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reflection (flip)
A move that involves flipping a figure over a line
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regroup Example 23 2 tens 3 ones     or 1 ten 13 ones
To exchange amounts of equal value to rename a number
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remainder
The number that is left over after dividing
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rhombus
A 2D figure with four equal sides whose opposite sides are parallel
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right angle
A right angle is a special angle. The corners of a sheet of paper are at right angles.
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round
Example 23 20 36 40
When you round a number to the nearest ten, you find the ten thats closest
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rotation (turn)
A move that involves turning a figure
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solid figure
3-dimensional figures with edges, faces and/or corners
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sphere
Any round object whose curved surface is the same distance from the center to all its points
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square
A plane figure with 4 equal sides and 4 right angles
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square pyramid
A solid 3-d figure with a base that is a square and four faces that are triangles with a common point
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standard form
Example 2,394
A way to write number by using the digits 0-9, with each digit having a place value
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subtraction
6 - 2 4
An operation on two or more numbers to find the difference
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sum
Example 12 7 19 The sum is 19
The answer to an addition problem
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symmetry
When one half of a figure looks like the mirror image of the other half
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tally table
A way to organize data using tally marks to show how often something happens
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temperature
A measurement of how hot or cold something is
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tenth
One of ten equal parts
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thermometer
An instrument for measuring temperature
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translation (slide)
A move that slides a figure a given distance in a given direction
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triangle
A plane figure with 3 sides and 3 angles
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triangular prism
A 3-d figure (solid) with two identical, triangular bases
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triangular pyramid
A 3-d figure (solid) with a triangular base and triangular faces that come to a point
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volume
The volume of this figure is 24 cubic units 3
x 2 x 4 24
The measure of space a solid figure occupies
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width
The measurement of an object from side to side
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whole numbers 0, 1, 2, 3, . . .
The set of numbers that includes 0 and all natural numbers
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word form two-hundred fifty-seven
A way to write numbers by using words
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yard (yd)
A customary unit used to measure length 1 yard 3 feet