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Math Vocabulary for 3rd grade
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Terms in this set (42)
Equation (e-QUAY-shun)
A number sentence that uses an equal sign to show that the value to its left is the same as the value to its right
Inverse operations
Operations that "undo" each other, such as addition and subtraction
Digits
The symbols 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9 use to write numbers
Place Value
The value of the place a digit has in a number
Example: the value of the digit 1 in 150 is hundreds.
Standard Form
A number written in a way that shows only its digits
Example: 123
Expanded Form
A number written as the sum of the values of its digits
Example: 3, 456
3000 + 400 + 50 + 6
Word Form
A number written in words
Example:
546 = five hundred forty-six
Round
To replace a number with another number which tells about how many or how much
Example: 79 rounds to 80
Addends (ADD-ends)
Numbers added together to give a sum
Sum
The answer when adding two or more addends
Commutative (Order) Property of Addition
Numbers can be added in any order and the sum stays the same
Associative (Grouping) Property of Addition
Numbers can be grouped in any way and the sum will stay the same
Identity (Zero) Property of Addition
The sum of zero and any number is that number
Difference
The answer when subtracting two numbers
Fact Family
A group of related facts using the same numbers
Compatible numbers (com-PAT-a-bull)
Numbers that are easy to add, subtract, multiply, or divide mentally
Multiplication
An operation that gives the total number when you join equal groups
Factors
Numbers that are multiplied to give a product
Product
The answer to a multiplication problem
Array
A way of displaying objects in equal rows
Commutative (Order) Property of Multiplication
Numbers may be multiplied in any order and the product will be the same.
Distributive Property
A multiplication fact that can be broken into the sum of two other multiplication facts example: 5 x 4 = (2 x 4) + (3 x 4)
Associative (Grouping) Property of Multiplication
The grouping of factors can be changed and the product will remain the same.
Dividend
The number to be divided
Divisor
The number by which another number is divided
Quotient
The answer to a division problem
Halves
Two (2) equal parts of a whole
Thirds
Three (3) equal parts of a whole
Fourths
Four (4) equal parts of a whole
Fifths
Five (5) equal parts of a whole
Sixths
Six (6) equal parts of a whole
Eighths
Eight (8) equal parts of a whole
Tenths
Ten (10) equal parts of a whole
Twelfths
Twelve (12) equal parts of a whole
Fraction
A symbol that names a part of a whole, a part of a set, or location on a number line
Examples: 1/2, 2/3
Numerator
The number above the fraction line (bar) in a fraction; it tells how many equal parts.
Denominator
The number below the fraction line (bar) in a fraction; it tells the total number of equal parts
Unit Fraction
A fraction with a numerator of 1
Example: 1/2
Benchmark fractions
Commonly used fractions such as 1/4, 1/3, 1/2, 2/3, and 3/4
Mixed number
A number with a whole number part and a fraction part
Example: 2-3/4
Equivalent fractions
Fractions that name the same number
Simplest form
A fraction with a numerator and denominator that cannot be divided by the same divisor, except 1
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