What is the result of adding 3 to −3?

What is the result of adding 20 to −20?

An elevator is on the 10th floor. It goes down 6 floors and then up 6 floors. What floor is the elevator on now?

Nancy was buying food for her birthday party. She bought a 52.93 oz bag of barbeque chips and a 79.6 oz bag of regular chips. How many ounces did she buy all together?

John ate some snacks with a total of 80.79 calories. If the chips he ate were 43.39 calories, how many calories were in the rest of his snack?

Derek is hanging streamers for the party. Each streamer is $$2\frac{2}{5}$$   meters long.

If he hangs 3 streamers end to end, what is the total length of the streamers?

A hamster weighs  $$4\ \frac{2}{6}$$  pounds.  A mouse weighs  $$3\ \frac{1}{2}$$  pounds.  How much more does the hamster weigh than the mouse? 

Which operation would you apply to solve this?

The elephant ate  $$3\ \frac{1}{9}$$  pounds of peanuts on Monday.  One Tuesday the elephant ate  $$5\ \frac{2}{3}$$  pounds.  How many pounds of peanuts did he eat altogether?

What is the area of a square with a side length of  $$\frac{2}{3}$$    inches?
Which operation would you apply to solve this?

A cinnamon muffin recipe called for 1 2/5 cups of chopped apples per 12 muffins. If Isabel wanted to make 48 muffins, how many apple would she need?