Operations of Fractions with Different Denominators

What is the least common denominator you could use to subtract 1/3 and 1/4?

• 3

• 4

• 24

• 12

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. 

Jada ate 3/8 of a pizza and Isaiah ate 1/4 of the pizza. How much pizza did they eat in all?

• 1/2

• 5/8

• 3/4

• 7/8

During lunch, Julio drinks 2  3/4 cups of milk.  Alan drinks 3/8 cups of milk.  Fernando drinks 1  1/6 cups of milk.  How much milk do the 3 gentleman drink? 

• 4  7/24 cups

• 3  7/32 cups

• 4  7/32 cups 

• 3  7/24 cups

What do you need to have when adding unlike fractions?

• common denominator

• common numerator

• common numerator and denominator

-1 ⁷/₈ + (-3 ¹/₂)

• 5 ³/₈

• -5 ³/₈

• 1 ⁵/₈

• -1 ⁵/₈

- 3/4  -  (-2/3)

• 1/12

• -1/12

• -17/12

• _1    5/12

What must you have to add and subtract fractions?

• Common numerators

• Different numerators

• Different denominators

• Common denominators

• 51/44

• 2 5/48

• 2 3/4

• 44/51

⁵/₆ + ²/₃ =

• ⁷/₆

• 1 ¹/₂

• ³/₆

• 1 ⁹/₆