Third Grade by Serena Georges Math Vocabulary Words

2-dimensional figure Plane figures that have length and width

3-dimensional figure 3-dimensional figures with edges, faces and/or corners

addend = 5; The addends are 2 and 3. A number that is added to another in an addition problem

addition = 5 The process of finding the total number of items when two or more groups of items are joined

analog clock A clock with numbers 1 through 12 around the face with rotating hands to show hours, minutes and seconds

area area = 9 square units The number of square units needed to cover a surfacesquare

array 3 x 4 = 12 An arrangement that shows objects in rows and columns

attribute Characteristics, size, shape and/or color

bar graph A graph that uses bars to show datadata

capacity The amount a container can hold when filled

centimeter 100 centimeters = 1 meter A metric unit for measuring lengthmetric

circle A closed 2D shape that is perfectly round

closed figure A figure that begins and ends at the same point point

cone A solid 3-d pointed figure that has a flat, round base with an apex

congruent figures Figures that have the same size and shape

corner vertex vertices The place where two or more edges meetedges

cube A solid figure with six congruent square faces and twelve vertices (corners)solid figure congruentsquarefaces

cubic units A standard unit for measuring volume The volume of this figure is 24 cubic units 3 x 2 x 4 = 24

cup Example: 2 cups = 1 pint A customary unit used to measure capacitycustomarycapacity

cylinder A solid 3-d figure that is shaped like a cansolid

decimal Examples: 0.5 five tenths 0.25 twenty-five hundredths A number with one or more digits to the right of the decimal pointdigitsdecimal point

decimal point A symbol used to separate dollars from cents in money and to separate the ones place from the tenths place in decimalsmoneydecimals

degree A unit for measuring temperature

degree Celsius (°C) A metric unit for measuring temperaturemetric

degree Fahrenheit (°F) A customary unit for measuring temperaturecustomary

denominator The number below the bar in a fraction. It tells the total number of equal parts or groups into which the wholefraction

difference Example: = 5 5 is the difference The answer in a subtraction problem subtraction

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

digital clock A clock that uses numerals only to tell the time

divide 6 divided by 3 = 2 To separate into equal groups

dividend 35 ÷ 5 = 7 The dividend is 35. The number that is to be divideddivided

divisor 18 ÷ 3 = 6 The divisor is 3. The number that divides the dividend dividesdividend

elapsed time The amount of time that passes from the start of an activity to the end of that activitytime From 3:00 p.m. to 4:00 p.m. the elapsed time is one hour.

edge The line segment where two faces of a solid figure meetline segmentfaces solid figure

equal to 45 Sign used to show numbers with the same value

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

equivalent fractions Two or more fractions that name the same amountfractions

estimate To use rounding to find out about how many Example: About 60

even number 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, A whole number that has 0, 2, 4, 6, or 8 in the ones placewhole number

expanded form 241 = A way to write numbers by showing the value of each digitdigit

face A flat surface of a 3-d figure

fact family Related facts using the same numbers Examples: = = = = 4 or 3 X 6 = ÷ 6 = 3 6 X 3 = ÷ 3 = 6

factors 3 x 8 = 24 The factors are 3 and 8 The numbers that are multiplied to give a product

fraction A number that names part of a whole (region) or part of a group

foot (ft) A customary unit used to measure length. 1 foot = 12 inches

gallon A customary unit used to measure capacity 4 quarts = 1 gallon

gram (g) A paper clip has a mass of about 1 gram. A metric unit used to measure mass

greater than Sign used to compare numbers

hexagon A polygon with 6 sides and 6 angles

heptagon A polygon with 7 straight sides and 7 angles

inch A customary unit used to measure length 12 inches = 1 foot

kilogram (kg) A metric unit used to measure mass 1,000 grams (g) – 1 kilogram (kg)

kilometer (km) A unit used to measure distance 1 km – 1,000 meters (m)

length The distance of an object measured from one end to the other

least likely It is least likely to pull a triangle An event that has a lesser chance of happening

less than Sign used to compare numbers

line segment Part of a line with two endpoints

line symmetry A line that divided a figure into two congruent parts

liter (L) A metric unit that is used to measure capacity

meter (m) A metric unit used to measure length or distance

measurement The act of measuring to determine the size of something

mile (mi) A customary unit used to measure length or distance

milliliter (ml) A small spoon holds about 5 milliliters. A metric unit used to measure capacity 1,000 milliliter (ml) = 1 liter (L)

millimeter (mm) A unit of length 10 millimeter (mm) = 1 centimeter (cm)

minutes Minutes measure short amount of time. There are 60 minutes in one hour.

minute hand The long hand on a clock

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

multiplication 3 x 4 = 12 An operation using repeated addition with two or more numbers

number line A line with equally spaced ticks and numbers

numeral A symbol that stands for a number

numerator The number above the fraction bar in a fraction. Tells how many equal parts.

open figure A figure that does not begin and end at the same point

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

octagon A polygon with 8 sides and 8 angles

odd number A whole number that has 1, 3, 5, 7 or 9 in the ones place Example: 1, 3, 5, 7, 9, 11, 13, 15, 17, 19,…..

ounce An ounce of gold A customer unit used to measure weight

ordinal number A number telling order or position

parallel lines Lines that never cross and are always the same distance apart Example:

parallelogram A plane figure with 2 pairs of parallel sides, 2 pairs of equal angles and 2 pairs of equal sides

pattern Repeated design or number sequence

pentagon A polygon with 5 sides and 5 angles

perimeter The distance around a figure 2 cm + 3 cm + 3 cm = 8 cm The perimeter of this figure is 8 cm.

pictograph A graph that uses pictures to show and compare information

pint A customary unit used to measure capacity 2 cups = 1 pint

place value Hundreds Tens Ones The value of the 5 is 50 or 5 tens. The value of a digit depending on its place in number

plane figure A figure in a plane that is formed by lines that are curved, straight or both

polygon A closed plane figure with straight sides

pound A customary unit used to measure weight

point A position on a number line or in space

product The answer to a multiplication problem 6 X 2 = 12 The product is 12

quadrilateral A polygon with 4 angles and 4 sides

quart A customary unit used to measure capacity 2 pints = 1 quart

quotient The answer in a division problem 35 ÷ 5 = 7 The quotient is 7

rectangle A plane figure with 4 sides and 4 right angles

rectangular prism A solid 3-d figure in which all 6 faces are rectangles

reflection (flip) A move that involves flipping a figure over a line

regroup Example: 23 = 2 tens 3 ones or 1 ten 13 ones To exchange amounts of equal value to rename a number

remainder The number that is left over after dividing

rhombus A 2D figure with four equal sides whose opposite sides are parallel

right angle A right angle is a special angle. The corners of a sheet of paper are at right angles.

round When you round a number to the nearest ten, you find the ten that’s closest Example:

rotation (turn) A move that involves turning a figure

solid figure 3-dimensional figures with edges, faces and/or corners

sphere Any round object whose curved surface is the same distance from the center to all its points

square A plane figure with 4 equal sides and 4 right angles

square pyramid A solid 3-d figure with a base that is a square and four faces that are triangles with a common point

standard form A way to write number by using the digits 0-9, with each digit having a place value Example: 2,394

subtraction An operation on two or more numbers to find the difference = 4

sum The answer to an addition problem Example: = 19 The sum is 19

symmetry When one half of a figure looks like the mirror image of the other half

tally table A way to organize data using tally marks to show how often something happens

temperature A measurement of how hot or cold something is

tenth One of ten equal parts

thermometer An instrument for measuring temperature

translation (slide) A move that slides a figure a given distance in a given direction

triangle A plane figure with 3 sides and 3 angles

triangular prism A 3-d figure (solid) with two identical, triangular bases

triangular pyramid A 3-d figure (solid) with a triangular base and triangular faces that come to a point

volume The measure of space a solid figure occupies The volume of this figure is 24 cubic units 3 x 2 x 4 = 24

width The measurement of an object from side to side

whole numbers {0, 1, 2, 3,...} The set of numbers that includes 0 and all natural numbers

word form two-hundred fifty-seven A way to write numbers by using words

yard (yd) A customary unit used to measure length 1 yard = 3 feet