Adding and Subtracting Fractions with Unlike 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).

Tags

CCSS.3.NF.A.2B

CCSS.3.NF.A.1

Front

What does it mean to have unlike denominators in fractions?

Back

Unlike denominators are when the bottom numbers of two or more fractions are different, making it necessary to find a common denominator to add or subtract them.

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Front

How do you find a common denominator for two fractions?

Back

To find a common denominator, identify the least common multiple (LCM) of the denominators.

Front

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

Back

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

Tags

CCSS.7.NS.A.1C

Front

How do you add fractions once you have a common denominator?

Back

Once you have a common denominator, add the numerators together and keep the common denominator.

Tags

CCSS.4.NF.B.3D

CCSS.4.NF.B.3C

Front

What is the process for subtracting fractions with unlike denominators?

Back

Similar to addition, first find a common denominator, then subtract the numerators while keeping the common denominator.

Tags

CCSS.7.NS.A.1C

Front

What is the result of adding 1/4 and 1/8?

Back

1/4 + 1/8 = 3/8 after finding a common denominator of 8.

Tags

CCSS.7.NS.A.1C

Front

What is the result of subtracting 3/4 from 1/2?

Back

1/2 - 3/4 = -1/4, which means you cannot subtract a larger fraction from a smaller one without getting a negative result.

Tags

CCSS.7.NS.A.1C

Front

How do you convert 3/4 to an equivalent fraction with a denominator of 8?

Back

Multiply both the numerator and denominator by 2: 3/4 = 6/8.

Tags

CCSS.4.NF.A.1

CCSS.3.NF.A.3B

Front

What is the sum of 5/7 and 2/3?

Back

5/7 + 2/3 = 1 and 8/21 after finding a common denominator of 21.

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2