Fraction Operations

How are adding, subtracting, and dividing fractions similar?

In which operation do you keep the fractions the same?

Which operations need to have a common denominator?

What is the rule for dividing fractions? 

What is the least common denominator? 2/3 + 3/4

What is 9/10 - 3/4?

2/5 $$\div$$  3/4

Alma made a fruit salad with  $$\frac{5}{12}$$    of a pound of melon and   $$\frac{1}{6}$$    of a pound of berries. How many pounds of fruit did Alma use in all?  

A pet store has $$\frac{1}{5}$$  of a bag of dog food to feed four dogs. Each dog gets an equal amount of food. Based on the model below, what fraction of the whole bag of dog food does each dog get?

(a)