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8 terms

Adding and Subtracting Fractions

To be a great mathematician you need mathematics vocabulary. Use these flashcards to study our vocabulary terms.
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Equivalent Fractions
Fractions that have different numerators and denominators but name the same amount.

Ex. 1/2 and 2/4 or 3/4 and 9/12
Simplest Form
A fraction is in simplest form when its numerator and denominator have no common factor other than 1.

Ex. 1/5 and 3/5 are in their simplest form because they have no other common factor other than 1.
Factor
Factors are numbers you can multiply together to get another number.
Benchmark Fraction
When you estimate a fractional amount you can use a benchmark fraction that is close to the actual amount.

Ex. about 1/2, or about 1/4
Common Multiple
A common multiple is a number that is a multiple of two or more numbers.

Ex. The multiples of 3 are: 3, 6, 9, 12, 15, 18, 21
The multiples of 6 are: 6, 12, 18, 24, 30, 36

*The common multiples between the two are 6, 12, and 18
Least Common Multiple (LCM)
A least common multiple (LCM) is the least number that is a multiple of both numbers.

The multiples of 3 are: 3, 6, 9, 12, 15, 18, 21
The multiples of 6 are: 6, 12, 18, 24, 30, 36

* The least common multiple is 6
Common Denominator
Fractions that have the same denominator have a common denominator.

Ex. 4/12 and 3/12 have a common denominator
Least Common Denominator (LCD)
The least common denominator (LCD) of two fractions is the least common multiple of the denominators.

Ex. Multiples of 2: 2, 4, 6, 8, 10, 12, 14
Multiples of 3: 3, 6, 9, 12, 15

*So the least common denominator (LCD) would be 12