Add and Subtract Like Fractions

+/- Like Fractions

Adding and Subtracting Fractions with Like Denominators
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part of a whole


top number in a fraction-tells how many equal parts are being used


bottom number in a fraction-tells the number of equal parts the top number is divided by


Fractions represent division

improper fraction

this fraction has a numerator greater than or equal to its denominator

mixed number

a whole number and a fraction

benchmark fractions

include the fractions 1/4, 1/3, 1/2, 2/3, and 3/4

unit fraction

a fraction whose numerator is always 1

equivalent fractions

fractions that name the same amount

common factor

of two numbers are factors that are the same that are called these

greatest common factor (GCF)

the greatest number that is a factor of both

simplest form

the numerator and denominator have no common factor other than 1

common denominator

denominators are the same

lowest terms

simplest form


5,10,15,20 or 3,6,9,12 or, 2,4,6,8,10... What do you notice?

least common multiple (LCM)

the least number that is a multiple of both numbers

least common denominator (LCD)

the least common multiple of the denominators


reduce or bring the fraction to lowest terms; simplest form

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