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