Adding and Subtracting Fractions with Unlike Denominators

When the denominators are not the same, I must find a...

• common numerator

• common denominator

• equivalent fraction

• mixed number

When adding or subtracting fractions, I NEVER add or subtract the...

• numerators

• denominators

• mixed numbers

• equivalent fractions

What is the best common denominator for this problem?

• 6

• 8

• 24

• 48

What is the first step in solving this problem? 
⅘ + ½ =

• Add the top parts of the fraction

• Rewrite the fractions in the simplest form. 

• Find a common denominator. 

• Make each fraction into an improper faction. 

What is the sum of these fractions?

• 4/5

• 3/20

• 17/20

• 4/20

What is the sum of these fractions in lowest terms?

• 4/5

• 3/20

• 17/20

• 4/20

Match the following fractions with their sums.

• 1/3 + 2/9

• 1/10

• 1/20 + 1/20

• 2 1/10

• 1/2 + 8/5

• 5/9

• 1 + 6/5

• 2 2/10

Aden is helping his dad paint his house. They mixed 5/9 gallons of white paint and 1/6 gallons of blue paint. How many gallons was the mixture in all?

• 6/18 gallons

• 13/18 gallons

• 4/5 gallons

• 1/6 gallons

Brianna filled an bathtub with 6/8 gallon of water.  Soon she realized that there was only 4/8 gallon of water.  How much water leaked out of the tub?

• 3/8

• 2/8

• 10/8

• 10/12

When adding or subtracting fractions, I always add or subtract the...

• numerators

• denominators

• mixed numbers

• equivalent fractions