Adding/Subtracting Fractions (uncommon denominators)

Front

What is a fraction?

Back

A fraction represents a part of a whole and consists of a numerator (top number) and a denominator (bottom number).

Front

What does it mean to have a common denominator?

Back

A common denominator is a shared multiple of the denominators of two or more fractions, allowing them to be added or subtracted.

Front

How do you find a common denominator for 1/5 and 5/6?

Back

The least common multiple (LCM) of 5 and 6 is 30, so 30 is a common denominator.

Front

What is the first step in adding fractions with different denominators?

Back

Find a common denominator for the fractions.

Front

Add the fractions: 1/3 + 1/5 = ?

Back

8/15

Front

Add the fractions: 3/20 + 3/4 = ?

Back

9/10

Front

Add the fractions: 3/8 + 1/2 = ?

Back

7/8

Front

What is the formula for adding fractions?

Back

(a/b) + (c/d) = (ad + bc) / (bd), where a/b and c/d are the fractions.

Front

Subtract the fractions: 5/8 - 2/5 = ?

Back

9/40

Front

What is the process for subtracting fractions with different denominators?

Back

Find a common denominator, convert the fractions, then subtract the numerators.