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Chapter 5 - Vocabulary Builder
Reading to Learn Mathematics
19
Mathematics
7th Grade
01/06/2010

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Term
Bar Notation
Definition
In repeating decimals, the line or bar placed over the digits that repeat. For example, 2.63 with a repeating bar over .63 indicates that the digits 63 repeat.
Term
Common Denominator
Definition
A common multiple of the denominators of two or more fractions, 24 is common denominator for 1/3, 5/8, & 3/4 because 24 is LCM of 3, 8, 4.
Term
Composite Number
Definition
A whole number greater than 1 that has more than two factors.
Term
Equivalent Fractions
Definition
Fractions that have the same value, 2/3 & 4/6 are equivalent fractions.
Term
Factor Tree
Definition
A diagram showing the prime factorization of a number. The factors branch out from the previous factors until all of the factors are prime #'s.
Term
Greatest Common Factor (GCF)
Definition
The greatest of the common factors of two or more numbers. The GCF of 18 & 24 is 6.
Term
Least Common Denominator (LCD)
Definition
The least of the common multiple of the denominators of two or more fractions.
Term
Least Common Multiple (LCM)
Definition
The least common of the multiples of two or more #'s. The LCM of 2 & 3 is 6.
Term
Multiple
Definition
The product of a number and any whole number.
Term
Percent
Definition
A ratio that compares a number to 100.
Term
Prime Factorization
Definition
Expressing a composite number as a product of prime numbers. For example, the prime factorization of 63 is 3x3x7.
Term
Prime Number
Definition
A whole number greater than 1 that has exactly two factors, 1 & itself.
Term
Ratio
Definition
A comparison of 2 numbers by division. The ratio of 2 to 3 can be written as 2 out of 3, 2 to 3, 2:3, or 2/3.
Term
Rational Numbers
Definition
Numbers that can be written as fractions, including terminating & repeating decimals, & integers.
Term
Repeating Decimals
Definition
A decimal whose digits repeat in groups of one or more. Examples are 0.181818.... & 0.8333
Term
Simplest Form
Definition
A fraction is in simplist form when the GCF of the numerator & the denominator is 1.
Term
Simplest Form
Definition
A fraction is in simplist form when the GCF of the numerator & the denominator is 1.
Term
Terminating Decimals
Definition
A decimal whose digits end. Every terminating decimal can be written as a fraction with a denominator of 10, 100, 1,000, & so on.
Term
Venn Diagram
Definition
A diagram that uses circles to show how elements among sets of numbers or objects are related.
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