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Unit 5 - Lesson 7 - Grade 5: Illustrative Mathematics

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Last updated 3 months ago
14 Questions
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Grade 5 Unit 5
Lesson 7: Round Doubloons
CC BY 2021 Illustrative Mathematics
Grade 5 Unit 5
Lesson 7: Round Doubloons
CC BY 2021 Illustrative Mathematics
Lesson: Round Doubloons

Notice and Wonder: A Digital Scale (Warm Up)

1.

What do you notice?

2.

What do you wonder?

Gold Doubloons

3.

  • Until 1728, doubloons weighed 6.867 grams.
  • After 1728, they weighed 6.766 grams.

You have a scale that measures weight to the
nearest tenth of a gram.


Was the doubloon on the scale made before or after 1728?

4.

If you had a scale that measured to the nearest gram, explain why you would not be able to tell what year the doubloon was made based on the weight listed on the scale.

5.

Which doubloons weigh more, the ones made before 1728 or the ones made after 1728? Explain or show your reasoning.

6.

Show the weights of the doubloons on the number line.

7.

Use the number line to find which hundredth of a gram the doubloon weights are each closest to.

8.

Use the number line to find which hundredth of a gram the doubloon weights are each closest to.

Exact or Approximate?

9.

Decide if the quantity is exact or an estimate. Be prepared to explain your reasoning.

There are 14 pencils on the desk.

10.

Decide if the quantity is exact or an estimate. Be prepared to explain your reasoning.

The population of Los Angeles is 12,400,000.

11.

Decide if the quantity is exact or an estimate. Be prepared to explain your reasoning.

It's 2.4 miles from the school to the park.

12.

Decide if the quantity is exact or an estimate. Be prepared to explain your reasoning.

The runner finished the race in 19.78 seconds.

Cool Down: A Golden Dollar
13.

A one-dollar gold coin weighs 1.672 grams.

A scale reads to the nearest tenth of a gram. What will the scale give for the weight of
this coin?

14.

A one-dollar gold coin weighs 1.672 grams.

A different scale reads to the nearest hundredth of a gram. What will the scale give for the weight of this coin?