Third Grade Go Math Vocabulary
Unit 1 Chapters 1-6
Chapter 1
1.
addition (add) The process of finding the total number of items when two or more items are joined together. The opposite of subtraction.
2.
difference: the answer to a subtraction problem 6-4=2
3.
hundreds: 100-999 10 tens make 100
4.
ones: 1-99
5.
regroup: to exchange amounts of equal value to rename a number 5+8=13 or 1 ten 3 ones
6.
subtract: the process of finding how many are left when a number of items are taken away from a group of items, the process of finding the difference when two groups are compared
7.
sum: the answer to an addition problem
8.
tens: something having 10 units or members
9.
compatible numbers: numbers that are easy to compute mentally
10.
estimate: to find about how many or how much
11.
expanded form: a way to write numbers by showing the value of each digit Example: 7,201= 7,000+200=1
12.
round: to replace a number with another number that tells about how many or how much
13.
standard form: a way to write numbers by using the digits
0-9, with each digit having a place value Example 345

14.
word form: a way to write numbers by using words
Example: the word form of 212 is two hundred twelve
Chapter 2
1.
bar graph: a graph that uses bars to show data
2.
data: information collected about people or things
3.
frequency table: a table that uses numbers to record data
4.
horizontal bar graph: a bar graph in which the bars go from left to right
5.
key: a part of a map or graph that explains the symbols
6.
line plot: a graph that records each piece of data on a number line
7.
pictograph: a graph that uses pictures to show and compare information
8.
results: the answers from a survey
9.
scale: the numbers placed at fixed distances on a graph to help label the graph
10.
survey: a method of gathering information
11.
tally table: a table that uses tally marks to record data
12.
compare: to describe whether numbers are equal to, less than or greater than each other

Chapter 3
1.
array: a set of objects in rows and columns
2.
commutative property of multiplication: the property that states that you can multiply two factors in any order and get the same product
3.
equal groups: groups that have the same number of objects. 5 x
6=30. There are 5 equal groups of 6 in 30
4.
factor: a number that is multiplied by another number to find the product
5.
identity property of multiplication: the property that stated that the product of any number and 1 is that number
6.
multiply: when you combine equal groups, you can multiply to find how many in all: the opposite operation of division
7.
product: the answer to a multiplication problem
8.
zero property of multiplication: the property that states that the product of zero and any number is zero
9.
addend: any of the numbers that are added in addition
10.
fact family: a set of related addition and subtraction, or multiplication and division, number sentences examples: 4 x 7=28 7 x 4=28 28/7=4 28/4=7
11.
number sentence: a sentence that includes numbers, operation symbols, and a greater than symbol, a less than symbol or an equal sign

Chapter 4
1.
associative property of multiplication: the property that states that when the grouping of factors is changed, the product remains the same.
2.
combination: the result of joining two or more things
3.
distributive property of multiplication: the property that states that multiplying a sum by a number is the same as multiplying each addend by the number and then adding the products.
4.
multiple: a number that is the product of a given number and a counting number
5.
tree diagram: an organized list that shows all possible outcomes and events
6.
variable: a symbol or a letter that stands for an unknown number
Chapter 5
1.
divide: to separate into equal parts
2.
dividend: the number that is to be divided in a division problem
3.
divisor: the number that divides the dividend
4.
inverse operations: opposite operations, or operations that undo one another, such as addition and subtraction or multiplication and division
5.
quotient: the number, not including the remainder, that results in division
Chapter 6

1. remainder: the amount left over when a number cannot be divided equally
Unit 2
Chapter 7
1.
denominator: the part of the fraction below the line which tells how many equal parts there are in the whole or in the group
2.
eighths; divided into 8 equal parts
3.
equal parts: parts that are exactly the same size
4.
fourths: divided into four equal parts
5.
fraction: a number that names part of a whole or part of a group
6.
halves: divided into 2 equal parts
7.
mixed number: a number given as a whole number and a fraction
8.
numerator: the part of the fraction above the line which tells how many parts are being counted
9.
sixths: divided into 6 equal parts
10.
thirds: divided into 3 equal parts
11.
unit fraction: a fraction that has 1 as its top number, or numerator

Chapter 8
1. benchmark numbers: numbers that are easy to work with, such as ½ and 1
2. compare: to describe whether numbers are equal to, less than, or greater than each other
3.
equivalent fractions: two or more fractions that name the same amount
4.
greater than (>): a symbol used to compare two numbers, with the greater number given first
5.
less than (<): a symbol used to compare two numbers, with the lesser number given first
Unit 3
Chapter 9
1.
acute angle: an angle that is less than a right angle
2.
angle: a shape formed by two rays that share the same endpoint
3.
closed shape: a two dimensional shape that begins and ends at the same point
4.
line: a straight path extending in both directions with no endpoints
5.
obtuse angle: an angle that is greater than a right angle but less than a straight angle
6.
open shape: a shape that does not begin and end at the same point
7.
plane shape: a shape on a flat surface that is formed by curves, line segments, or both

8.
point: an exact position or location
9.
polygon: a closed plane shape with straight sides
10.
right angle: an angle that forms a square corner. It measures 90*.
11.
Two-dimensional shape: plane shapes that have length and width
Chapter 10
1.
congruent: shapes that have the same size and the same shape are congruent
2. diagonal: a line segment that connects two vertices of a polygon that are not next to each other
3. growing patterns: a pattern in which the number or figure increases
or decreases over time
4. line of symmetry: an imaginary line that divides a figure into two congruent parts
5.pattern unit: that part of a pattern that is repeated
6. repeating pattern: a pattern in which the pattern unit is used over
and over again
Chapter 11
1.
centimeter (cm) a metric unit for measuring length or distance
2.
decimeter (dm) a metric unit for measuring length or distance

3.
foot (ft) a customary unit for measuring length or distance
4.
kilometer (km): a metric unit for measuring length or distance
5.
length: the measurement of the distance between two points
6.
meter (m): a metric unit for measuring length or distance
7.
mile (mi): a customary unit for measuring length or distance
8.
millimeter (mm): a metric unit for measuring length or distance
9.
perimeter: the distance around a figure
10.
yard (yd) a customary unit for measuring length or distance
Chapter 12
1.
A.M.: the times from midnight to noon
2.
analog clock: a clock with minute and hour hands
3.
calendar: a table that shows the days, weeks and months or a year
4.
century: a measure of time equal to 100 years
5.
decade: a measure of time equal to 10 years
6.
digital clock: a clock that shows time to the minute using digits
7.
elapsed time: the amount of time that passes from the start to the end of an activity
8.
midnight: twelve o’clock at night
9.
minute: a unit used to measure the time, the minute hand moves from one mark to the next

10.
11.
12.
13.
noon: twelve o’clock in the daytime
P.M.: the times from noon to midnight
time line: shows sequence or order of events
year: a measure of time equal to twelve months.