End of Unit 7.5 - Operations with Rational Numbers Review

Christy worked the division problem shown. Do you agree with her work?

• No! She should have divided the numbers after she flipped the first fraction.

• Yes! She did everything right!

• No! She should have flipped the 2nd fraction instead of the first one!

• No! She should have divided across after she flipped the fraction!

Ellis solved the problem shown. Analyze his work and decide if you agree with his strategy.

• I disagree with him! He should have cross-multiplied to find his answer!

• I disagree with him! He should have just multiplied straight across. You don't need common denominators when multiplying fractions!

• I agree! I don't see any problems with it!

• I disagree! He should have used KEEP CHANGE FLIP!

A submarine is 10 feet underwater. The crew adds 4 anchors, removes 3 floats, then adds 9 floats. Where is the submarine now located?

• 26 feet

• -20 feet

• -8 feet

• 12 feet

A submarine is 40 feet underwater. The crew removes 10 anchors, removes 6 floats, and adds 12 floats.

• 24

• -24

• -66

• 66

How much change would Miss Lawrence receive if she purchased 3.5 pounds of salmon at $7.30 per pound if she handed the cashier at $50 bill?

• $25.55

• $24.45

• $25.45

• $24.55

Mr. Voltin is having a partay! He is buying racks of ribs for all to cook. He purchases 12 racks for $8.25 each. If he hands the cashier a $100 bill, how much change should he receive?

• $99

• $1

• $2.50

• $4.75

Miss Carpenter is having a bake sale to raise money for a class Christmas party! She spends $32 on ingredients to bake her famous cookies. Unfortunately she only made $15 at bake sale. Which equation represents Miss Carpenter's profit?

• 32 + 15 = 47

• (-32) + 15 = -17

• (-32) + (-15) = -47

• 32 - 15 = 17

From 10 meters below sea level, Mr. Shaffer took off in his private helicopter and ascended 100 meters. Which integer represents Mr. Shaffer's elevation now?

• 90

• -90

• 110

• -110

Miss Cross on a hike. She started at 800 meters above sea level and went up 120 meters. Which equation represents her final location?

• 800 - 120 = 680

• 800 + (-120) = 680

• 800 + 120 = 920

• (-800) + 120 = -680

What is the first step when adding this fraction?

• Add the numerators

• Add the denominators

• Find common numerators

• Find common denominators