Third Grade
Mathematics
Vocabulary
Created by Carrie Schoenfelder
Staff Development Teacher
Strawberry Knoll Elementary School
Grade 3 ~ Carrie Schoenfelder ~ 2004
x+ 5
4n ÷ 6
an expression that includes at least
one variable
algebraic
expression
Grade 3 ~ Carrie Schoenfelder ~ 2004
5 – x: 5 decreased
by a number
x - 5: a number
decreased by 5
a function is considered to be decreasing
if c(b)
< c(a) when b > a.
decreasing
Grade 3 ~ Carrie Schoenfelder ~ 2004
show the meaning of; explain
interpret
Grade 3 ~ Carrie Schoenfelder ~ 2004
x + y addition
x – y subtraction
x (y) multiplication
x y division
y
exponentiation [powers]
x
y
x
extraction [roots]
a procedure; a thought process;
an action or set of actions used
to achieve a result
operation
Grade 3 ~ Carrie Schoenfelder ~ 2004
on a graph, the numbers placed at
fixed distances to help label the
graph
scale (graph)
Grade 3 ~ Carrie Schoenfelder ~ 2004
ten times one hundred, expressed
by 1,000
thousand
Grade 3 ~ Carrie Schoenfelder ~ 2004
decreasing
5
4
3
2
1
increasing
same
00’
01’
02’
03’
on a graph, areas where the
data increase, decrease, or
stay the same over time
trend
Grade 3 ~ Carrie Schoenfelder ~ 2004
convert the
decimal number to a fraction
0. 75
3
4
to rewrite an expression using a
different notation or using a different
unit of measure
Grade 3 ~ Carrie Schoenfelder ~ 2004
convert the distance from
miles to feet
How many feet do I walk if I walk two
miles to get to school?
1 mile = 5,280 feet
to rewrite an expression using a
different notation or using a different
unit of measure
Grade 3 ~ Carrie Schoenfelder ~ 2004
1 meter (m)
1,000 milimeters (mm)
1 meter (m)
(cm)
100 centimeters
1 meter (m)
10 decimeters (dm)
1 kilometer (km)
1,000 meters (m)
a metric unit for measuring length
and distance
Grade 3 ~ Carrie Schoenfelder ~ 2004
the outer boundary
perimeter
Grade 3 ~ Carrie Schoenfelder ~ 2004
4 cm + 4 cm + 5 cm = 13 cm
The perimeter of this figure is
14 centimeters
the distance around a figure
perimeter
Grade 3 ~ Carrie Schoenfelder ~ 2004
one
square
unit
a square with a side length of one
unit; used to measure area
square unit
Grade 3 ~ Carrie Schoenfelder ~ 2004
36 inches = 1 yard
y
a
r
d
s
t
1
3
f e e t
i
c
k
2
=
1
3
yard
a customary unit for measuring length or
distance
Grade 3 ~ Carrie Schoenfelder ~ 2004
Columns
Rows
3 X 4 = 12
an arrangement that shows
objects in rows and columns
Grade 3 ~ Carrie Schoenfelder ~ 2004
5X7=7X5
the property that states
that when the order of two
or more factors is changed,
the product is the same
commutative
Grade 3 ~ Carrie Schoenfelder ~ 2004
5 + 4 = 9, so 9 – 4 = 5
or
3 x 4 = 12, so 12 ÷ 4 = 3
opposite operations that undo each other;
addition and subtraction are inverse
operations; multiplication and division are
inverse operations
inverse
operations
Grade 3 ~ Carrie Schoenfelder ~ 2004
35 ÷ 5 = 7
7
5 35
The quotient is 7.
the number, not including the
remainder, that results from
dividing
Grade 3 ~ Carrie Schoenfelder ~ 2004
4 X 7 = 28
4
X7
28
The factors are 4 and 7
a number that is multiplied
by another number to find a
product
Grade 3 ~ Carrie Schoenfelder ~ 2004
6 X 2 = 12
6
X2
12
The product is 12.
the answer to a
multiplication problem
Grade 3 ~ Carrie Schoenfelder ~ 2004
a figure formed
by two rays
Grade 3 ~ Carrie Schoenfelder ~ 2004
a closed plane shape with
straight lines
Grade 3 ~ Carrie Schoenfelder ~ 2004
a closed plane shape with
5 sides and 5 corners
Grade 3 ~ Carrie Schoenfelder ~ 2004
an angle whose
measure is 90
degrees
right angle
Grade 3 ~ Carrie Schoenfelder ~ 2004
a closed plane shape with
eight sides and eight corners
Grade 3 ~ Carrie Schoenfelder ~ 2004
the movement of a shape
over a line
Grade 3 ~ Carrie Schoenfelder ~ 2004
a movement of a figure to a
new position without turning
or flipping
Grade 3 ~ Carrie Schoenfelder ~ 2004
A
point A
An exact location in space
usually represented by a dot
Grade 3 ~ Carrie Schoenfelder ~ 2004
the movement of a figure to
a new position by rotating
the figure around a point
Grade 3 ~ Carrie Schoenfelder ~ 2004
an event is certain if it will
always happen.
Grade 3 ~ Carrie Schoenfelder ~ 2004
Grade 3 ~ Carrie Schoenfelder ~ 2004
Grade 3 ~ Carrie Schoenfelder ~ 2004
= 4 cubic
units
a cube with a side length of
one unit; used to measure
volume
cubic unit
Grade 3 ~ Carrie Schoenfelder ~ 2004
Grade 3 ~ Carrie Schoenfelder ~ 2004
a symbol used to separate dollars from
cents in money and to separate the ones
place from the tenths place in decimals.
decimal point
Grade 3 ~ Carrie Schoenfelder ~ 2004
denominator
the number below the bar in a fraction
that tells how many equal parts of the
whole has been divided
denominator
Grade 3 ~ Carrie Schoenfelder ~ 2004
the amount of time that passes from
the start of an activity to the end of
that activity
elapsed time
Grade 3 ~ Carrie Schoenfelder ~ 2004
=
two or more sets that name the same
amount
equivalent
Grade 3 ~ Carrie Schoenfelder ~ 2004
something that happens
Grade 3 ~ Carrie Schoenfelder ~ 2004
numerator
the number above the bar in a fraction
that tells how many equal parts of the
whole are being considered
numerator
Grade 3 ~ Carrie Schoenfelder ~ 2004
3
2
1
0
(1,2)
1
2
3
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
ordered pair
Grade 3 ~ Carrie Schoenfelder ~ 2004
a possible result of an
experiment
outcomes
Grade 3 ~ Carrie Schoenfelder ~ 2004
= 1 pound
a customary unit for
measuring weight
Grade 3 ~ Carrie Schoenfelder ~ 2004
a polygon with four sides
quadrilateral
Grade 3 ~ Carrie Schoenfelder ~ 2004
=
1 quart
unit for measuring
Grade 3 ~ Carrie Schoenfelder ~ 2004
Ray CD
C
D
a part of a line, with one endpoint, that
continues without end in one direction
Grade 3 ~ Carrie Schoenfelder ~ 2004
unknown
Grade 3 ~ Carrie Schoenfelder ~ 2004
volume
Grade 3 ~ Carrie Schoenfelder ~ 2004