7th Grade Lesson 8

Presentation

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Mathematics

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7th Grade

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Hard

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CCSS

7.NS.A.3, 7.NS.A.2B, 6.NS.C.7C

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Ms. Voltz

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3 Slides • 4 Questions

7th Grade: Lesson 8

Solve Problems with Rational Numbers

Solve using Addition/Subtraction

A sugar water solution freezes at -1.8 degrees Celsius. A saltwater solution freezes at -13.6 degrees Celsius. What is the difference between the freezing temperature of the sugar-water solution and that of the saltwater solution?
Estimate to show that your answer is reasonable.

Solve using Multiplication/Division

Ally, Bobby, and Sarah will share the cost of a cabin rental for a week. Ally agrees to pay 0.3 of the cost. Bobby agrees to pay 0.45 of the cost. Sarah will pay the remaining balance. If the total rental cost is $960, how much will Ally, Bobby, and Sarah each pay towards the week's rent?

Multiple Choice

Which is the best estimate of

-\frac{15}{6}\div\ \left(-\frac{1}{2}\right)?

1/2

-2

Multiple Choice

A scientist measures change in the temperature of a chemical solution. At the start of the experiment, the solution is at a temperature of -14.96 degrees Celsius. The temperature decreases 2.9 degrees Celsius each hour.

What is the temperature of the solution after 3 hours, rounded to the nearest whole degree? Estimate to show your answer is reasonable.

-20 degrees Celsius

-24 degrees Celsius

0 degrees Celsius

None of the above

Multiple Select

What is the best estimate of

-\frac{15}{16}+\left(-\frac{1}{2}\right)?

$-1\ \frac{1}{2}$

$-\frac{3}{2}$

$1\ \frac{1}{2}$

-1.5

Multiple Choice

Beth plays a video game in which she starts with 0 points. in round 1, she loses 3.5 points; in round 2, she wins 28.5 points; and in round 3, she loses another 3.5 points. What is her final score?

-18.5

18.5

21.5

35.5

7th Grade: Lesson 8

Solve Problems with Rational Numbers

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