Adding and Subtracting Fractions

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

How do you add fractions with the same denominator?

Back

To add fractions with the same denominator, keep the denominator the same and add the numerators. For example, 4/15 + 5/15 = (4+5)/15 = 9/15.

Front

How do you subtract fractions with the same denominator?

Back

To subtract fractions with the same denominator, keep the denominator the same and subtract the numerators. For example, 5/7 - 2/7 = (5-2)/7 = 3/7.

Front

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

Back

The first step is to find a common denominator for both fractions.

Front

What is a common denominator?

Back

A common denominator is a number that is a multiple of the denominators of two or more fractions.

Front

How do you find a common denominator for 1/2 and 1/3?

Back

The common denominator for 1/2 and 1/3 is 6, because 6 is the smallest multiple of both 2 and 3.

Front

What is the result of 3/9 + 4/9?

Back

7/9

Front

What is the result of 9/10 - 2/10?

Back

7/10

Front

What do you do if the denominators are different when adding fractions?

Back

You must first find a common denominator before adding the fractions.

Front

What is the result of 5/7 - 2/7?

Back

3/7