Adding and Subtracting Fractions with Unlike Denominators and Mixed Numbers

Solve.

• 1 1/12

• 7/12

• 3/4

• 1 1/2

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. 

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

Stacy used 1/4 cup of sugar and 2/3 cup of flour to bake a cupcakes. How much more flour did Stacy use than sugar?

• 11/12 cup

• 10/12 cup

• 6/12 cup

• 5/12 cup

When adding or subtracting fractions with unlike denominators, what is the first step?

• Add the numerators

• Add the denominators

• Find a common denominator

When adding and subtracting fractions, what needs to be the same?

• the numerator

• the denominator

• nothing

• everything

How can you find a common denominator?

• Add the denominators together

• Pick your favorite number

• Find a common multiple for the two denominators

After changing the denominator, what do you need to do to the numerator?

• Nothing

• Multiply the numerator by the same number as the denominator

• Double it

What number could be a common denominator for these two fractions?
2/3   and   3/4

• 3

• 4

• 7

• 12