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Measurement and Data 4.MD.1

Lesson 3 Metric Units of Mass

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Geneva subscribes to a nature magazine. Is it reasonable to estimate that the mass of one issue of the magazine is 25 grams or 25 kilograms? Twenty-five kilograms is too much.

Copyright © The McGraw-Hill Companies, Inc. (l to r, t to b)Lew Robertson/CORBIS, Stockdisc/PunchStock, Steve Cohen/FoodPix/Getty Images, Fuse/Getty Images

You know that the mass of 1 penny is about 1 gram. Imagine holding 25 pennies in one hand and a magazine in the other. They would probably feel about the same. So, it is reasonable to say the mass of one magazine is about 25 grams.

Practice Circle the more reasonable estimate for each mass. 2.

1.

1,500 grams

1,500 kilograms

3.

5 grams

5 kilograms

4.

3 grams

3 kilograms

14 grams

14 kilograms

Lesson 3 My Homework791

Complete the table by writing a reasonable unit of mass, grams or kilograms, for each object.

5.

grape

1

6.

pumpkin

2

7.

apple

8.

cantaloupe

9.

potato

150 1 1

Problem Solving 10. The mass of a pen cap is 1 unit. What metric unit, gram or kilogram, was used to measure the mass of the pen cap?

6

11.

Explain to a Friend Julio is buying a carton

of blueberries that has a mass of 100 grams. Is it reasonable to say that there are 250 blueberries in the carton? Explain.

Vocab

Vocabulary Check Match each vocabulary term to its definition or example.

• • •

12. kilogram 13. mass 14. gram

the amount of matter an object has a metric unit of mass equal to about 1 penny 1,000 grams

Test Practice 15. Which is a reasonable estimate for the mass of a toothbrush? A

2 grams

B

20 grams

792Need more practice? Download Extra Practice at

C

200 grams

D

2,000 grams

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Copyright © The McGraw-Hill Companies, Inc. (l to r, t to b)Ingram Publishing/Alamy, Jules Frazier/Photodisc/Getty Images, Siede Preis/Photodisc/Getty Images, Burke Triolo Productions/Artville/Getty Images, D. Hurst/Alamy, The McGraw-Hill Companies

Mass of Fruits and Vegetables Object Mass (g or kg)

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apple. 150 cantaloupe. 1 potato. 1. 6. 7. 8. 9. Problem Solving. 10. The mass of a pen cap is 1 unit. What metric unit, gram or kilogram, was used to measure the ...

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