Download 3rd Grade Math Dictionary

Math Vocabulary 3rd Grade
1
arithmetic
another word for math or mathematics
2
+
addition, add, plus
3
X
multiplication, multiply, times
4
-
subtraction, subtract, minus
5
÷
division, divide, divided by
⌐
6
=
equal, having the same value, the same on both sides, equivalent
7
≠
not equal
8
#
number
9
( )
parentheses
10
>
greater than
11
<
less than
Math Vocabulary 3rd Grade
addition, subtraction, multiplication and division are the four math
12 math operations operations
13
addition
14
addends
15
3+6=9
16
sum
the adding of two or more numbers to get a sum or total
numbers that are added together
equation, number sentence written horizontally
the answer in addition
zero property of
addition
zero plus any number equals the number, 821+0=821
17
18
grouping
property of
addition
the addends may be grouped in any order and you still get the same sum
(6+2)+4=12 or 6+(2+4)=12
order property of the addends may be added in any order and you still get the same sum
addition
5+3=8, 3+5=8, 5+3=3+5
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20
subtraction
21
difference
to take one number away from another number
the answer in subtraction
Math Vocabulary 3rd Grade
22
minuend
23
24
subtrahend
regroup
25
numeration
26
ascending
in order from least to greatest
27
descending
in order from greatest to least
28
inverse
the number from which another number is subtracted
the number that is subtracted from the minuend
to exchange amounts of equal value; to rename a number
the study of numbers
opposite operations - one operation undoes the other; addition is inverse of
subtraction; multiplication is inverse of division
number sentences that have the same numbers in them and show how
addition and subtraction are related
29
family of facts
30
digits
31
face value
what a digit looks like (5 looks like a five)
32
place value
the place a digit is given on a grid
33
total value
the total value of a digit (5 in the tens place has a value of 50)
the ten symbols we use to write numbers 0,1,2,3,4,5,6,7,8,9
(5 is in the tens place)
Math Vocabulary 3rd Grade
34
written form
35
36
expanded form
standard form
37
column or
working form
38
estimate
39
round
40
horizontal
41
vertical
42
diagonal
43
44
a way to write numbers by using words ex two hundred fifty-one
456=400+50+6, telling the total value for each digit
any number that we write or see in a book, 263
a number sentence written vertically
to find an answer that is close to the exact number
replace a number with another number that tells about how many or how
much ex round 65 to the nearest ten = 70; round 435 to the nearest
hundred = 400
a line that goes from left to right or right to left
a line that goes up and down
a line that goes from corner to corner
even number
any number that can be shared equally by two people, any number that can be
counted by twos, any number that has 0,2,4,6,8 in the ones column
odd number
any number that cannot be shared equally by two people; any number that has
1,3,5,7,9 in the ones column
Math Vocabulary 3rd Grade
45
benchmark
number
any number which is a point of reference; often used to show number
relationships
46 cardinal number any number which tells how many such as 6 cars
47
compatible
numbers
numbers that are easy to compute mentally 50+50 instead of 48+54
48 nominal number any number that names things such as a telephone number or an address
49 ordinal number
50
period
51
Venn diagram
any number which tells position or order such as 1st, sixth
each group of three numbers in a large number
uses circles to show relationships among different sets of things
52 multiplication
the operation of repeated addition of the same numer
53
multiple
a number that is the product of a given number and another whole number
ex. multiples of 3 are 6,9,21,24,30
54
array
an arrangement of objects in rows and columns
Math Vocabulary 3rd Grade
55
56
product
factor
the answer to a multiplication problem
a number that is multiplied by another number to find a product
ex 2 x 4 = 8
property of one when one of the factors in a multiplication problem is one, the product is
57 for multiplication the other factor ex 6 x 1 = 6
zero property of when one of the factors in a multiplication problem is zero, the product is
58 multiplication zero ex 8 x 0 = 0
order property of two numbers in a multiplication problem can be multiplied in any order, and
ex
multiplication the product will be the same
(commutative)
6 x 2 = 12 2 x 6 = 12 therefore 6 x 2 = 2 x 6
59
grouping
property of
multiplication
60
(associative)
61
fact family for
multiplication
when the grouping of factors in a multiplication problem is changed, the
product will remain the same
ex (4 x 2) x 5 = 8 x 5 = 40 ; 4 x (2 x 5) = 4 x 10 =40
a set of related multiplication and division sentences using the same
numbers
Math Vocabulary 3rd Grade
62
division
63
dividend
64
divisor
65
quotient
66
remainder
the operation of making equal groups and finding the number in each
group or the number of groups
a number that is divided by another number
the number that divides the dividend
the answer in a division problem
the amount left over when you find a quotient
a number is divisible by another number if the result of the division is a
whole number with a remainder of zero
67
divisible
68
fraction
a number that names part of a whole or part of a group
69
numerator
the number above the bar in a fraction tat tells how many parts are being
considered
70
denominator
the number below the bar in a fraction that tells the number of equal parts
71
equivalent
fractions
two or more fractions that name the same amount
Math Vocabulary 3rd Grade
72
like fractions
fractions with the same denominators
73 unlike fractions fractions with different denominators
74 mixed number a number that is made up of a whole number and a fraction
geometry
the branch of mathematics that deals with lines, angles, planes, and
figures and with measuring them
solid figure
a figure which has length, width and thickness
cylinder, rectangular prism, square prism
77
plane figure
a figure which has a flat surface
rhombus, trapezoid, hexagon
78
face
a flat surface of a solid figure
79
edge
the line where 2 faces meet
80
corner
a point where 2 or more sides meet
81
vertex
corner
82
line
83
line segment
75
76
ex rectangle, square, circle, triangle,
goes on without end in both directions
a part of a line with two endpoints
ex cone, cube, sphere,
Math Vocabulary 3rd Grade
84
ray
part of a line that has one endpoint
85
parallel lines
lines that are always the same distance apart
86
intersecting
lines
lines that meet or cross
87
perpendicular
lines
88
angle
89
acute angle
90
obtuse angle
91
right angle
92
formula
93
perimeter
lines that meet or cross each other and form 4 right angles
when two rays share an endpoint
an angle smaller than a right angle
an angle larger than a right angle
an angle that forms a square corner
an equation that tells how to solve a problem (area = l x w)
the distance around a figure (P = 2l + 2w
P= 2 lengths + 2 widths) (linear)
Math Vocabulary 3rd Grade
94
area
95
96
data
tally table
the number of square units to cover a flat surface (square unit)
(A = length x width)
information about people and things
uses tally marks to show how often something happens
97 frequency table uses numbers to show how often something happens
98
experiment
99
survey
a set of questions that a group of people are asked
100
results
answers from a survey
101
scale
102
outcomes
103
interval
104
line graph
105
circle graph
a test done in order to find out something
a series of numbers placed at fixed distances on a graph to help label the
graph
possible results of an experiment
the distance between two numbers on the scale of a graph
a graph that uses a line to show how data changes over a period of time
a graph that shows data as part of a whole circle
Math Vocabulary 3rd Grade
106
bar graph
a graph that uses data that can be counted
107
probability
108
event
109
certain
an event that will always happen
110
impossible
an event that will never happen
111
predict
112
likely
the chance that a given event will occur
the action that happens in an experiment that brings about an outcome
to tell what might happen when doing experiments
a "high" possibility that an event will happen
possible
113 outcomes (ways) all the possible outcomes of an experiment
114
fairness
115
equally likely
when one outcome is not more likely to happen than another
when the outcomes of an experiment have the same chance of happening.