Third Gradeby

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 2 + 3 = 5;

The addends are 2 and 3.

A number that is added to another in an addition problem

addition 3 + 2 = 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

areaarea =

9 square units

The number of square units needed to cover a surface

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 data

capacity

The amount a container can hold when filled

centimeter 100 centimeters =

1 meter

A metric unit for measuring length

circle

A closed 2D shape that is perfectly round

closed figure

A figure that begins and ends at the same 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 meet

cube

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

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 capacity

cylinder

A solid 3-d figure that is shaped like a can

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

decimal

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

degree

A unit for measuring temperature

degree

Celsius (°C)

A metric unit for measuring temperature

degree

Fahrenheit (°F)

A customary unit for measuring temperature

denominator

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

difference Example:

8 - 3 = 5

5 is the difference

The answer in a subtraction problem

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 divided

divisor

18 ÷ 3 = 6      

The divisor is 3.

The number that divides the dividend

elapsed time

The amount of time that passes from the start of an activity to the end of that activity

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 meet

equal to 45 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 amount

estimate

To use rounding to find out about how many

Example:23 2036 +40

About 60

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

expanded form

241 =

200 + 40 + 1

A way to write numbers by showing the value of each digit

face

A flat surface of a 3-d figure

fact

family

Related facts using the same numbers

Examples:2 + 4 = 6       6 - 4 = 24 + 2 = 6       6 - 2 = 4

or3 X 6 = 18       18 ÷ 6 = 36 X 3 = 18       18 ÷ 3 = 6

factors3 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 64 56

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

likelyIt is least likely to pull

a triangle

An event that has a lesser chance of happening

less

than 56 64

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 45

23

67

18

98

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,… . .

ounceAn 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 cmThe 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 4 5 0

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:23 2036 40

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

6 - 2 = 4

sum

The answer to an addition problem

Example:12 + 7 = 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 formtwo-hundred

fifty-seven

A way to write numbers by using words

yard

(yd)

A customary unit used to measure length

1 yard = 3 feet