Adding/Subtracting Fractions Unlike Denominator

Solve.

• 5/8

• 23/40

• 21/40

• 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

(Choose one that is true) When you add or subtract fractions with unlike denominators you..

• Add both the numerators and denominators

• Change the denominator by picking a random number then divide

• Find the least common multiple of both denominators

• none of these are true

• 5/6
• 1
• 1  1/6
• 8/6

• - 3/56
• 18/56
• - 4/15
• 29/56

What is the least common denominator for this problem? 3/16 + 2/4 =

• 24

• 8

• 16

• 32

What is the least common denominator of 1/7 and 3/6?

• 14

• 21

• 7

• 42

What is the least common denominator of 6/8 and 4/12?

• 12

• 24

• 8

• 16