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.
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
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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