Adding Rational Fractions

What is the sum of these fractions?

-3/4 + 0.5 =

• 0.25

• 1.25

• -0.25

• -1.25

Fill in the blank for the following rule: If the rational numbers have same signs, ______________ and keep the common sign.

• add

• subtract

• multiply

• divide

• - 1  7/40
• 15/40
• - 1 10/40
• 17/40

Mathematical Equivalence

ON

Vito is making a mixture to feed his cat. He uses 1/4 lb of dry cat foot, 1/6 lb of moist cat food, and 1/8 lb of cat treats. What is the total amount of cat food that Vito is mixing?

• 1/6  lb

• 5/12  lb

• 15/22  lb

• 13/24  lb

Danotia ate 4 5/8 pizzas. Bellisarius devoured 5 3/8 pizzas. How many pizzas did they consume altogether?

Simplify your answer correctly.

• 9 8/8 pizzas

• 80/8 pizzas

• 10 pizzas

• 9 7/8 pizzas

Which answers are correct (though not necessarily properly simplified) answers to: 7 1/5 - 4 4/5 ?

• 3 5/5

• 12/5

• 11 3/5

• 2 2/5

What must be the same to add or subtract fractions?

What would you need to do to add 3 3/5 + 7 9/13

• Make both denominators 65 (5 x 13)

• Add the tops and add the bottoms and add the whole numbers

• change each to an improper fraction

• skip it and go on!