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EXAMPLE 1 Choosing Units of Mass An item has a mass of 10.3 kilograms. Is it a dog or a pencil ? Explain.

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EXAMPLE 1 Choosing Units of Mass An item has a mass of 10.3 kilograms. Is it a dog or a pencil ? Explain. The mass of a book is about 1 kg, so 10.3 kg is the mass of about 10 books.

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EXAMPLE 1 Choosing Units of Mass An item has a mass of 10.3 kilograms. Is it a dog or a pencil ? Explain. The mass of a book is about 1 kg, so 10.3 kg is the mass of about 10 books The mass of a dog is closer to the mass of 10 books, so the item is a dog

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EXAMPLE 2 Choosing Units of Capacity Tell whether the most appropriate unit to measure the capacity of the item is milliliters, liters, or kiloliters.

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EXAMPLE 2 Choosing Units of Capacity Tell whether the most appropriate unit to measure the capacity of the item is milliliters, liters, or kiloliters. a. bucket b. teaspoon

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EXAMPLE 2 Choosing Units of Capacity Tell whether the most appropriate unit to measure the capacity of the item is milliliters, liters, or kiloliters. a. bucket b. teaspoon SOLUTION The capacity of a bucket is closest to the capacity of a large bottle of water. You should use liters.

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EXAMPLE 2 Choosing Units of Capacity Tell whether the most appropriate unit to measure the capacity of the item is milliliters, liters, or kiloliters. a. bucket b. teaspoon SOLUTION The capacity of a bucket is closest to the capacity of a large bottle of water. You should use liters. The capacity of a teaspoon is closest to the capacity of an eyedropper.You should use milliliters.

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EXAMPLE 3 Choosing Metric Units Choose an appropriate metric unit to measure the item.

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EXAMPLE 3 Choosing Metric Units Choose an appropriate metric unit to measure the item. a. mass of an eraser b. capacity of a bottle of nail polish

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EXAMPLE 3 Example 3 Adding Whole Numbers Choosing Metric Units SOLUTION a. The mass of eraser is much greater than one milligram and much less than one kilogram. So, you should use grams.

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EXAMPLE 3 Example 3 Adding Whole Numbers Choosing Metric Units SOLUTION a. The mass of eraser is much greater than one milligram and much less than one kilogram. So, you should use grams. b. The capacity of a bottle of nail polish is much less than one liter or one kiloliter. So, you should use milliliters.

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**1. Mass An animal has a mass of 56 grams. Is it a cat or a**

GUIDED PRACTICE for Examples 1, 2, and 3 1. Mass An animal has a mass of 56 grams. Is it a cat or a mouse? Explain.

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**1. Mass An animal has a mass of 56 grams. Is it a cat or a**

GUIDED PRACTICE for Examples 1, 2, and 3 1. Mass An animal has a mass of 56 grams. Is it a cat or a mouse? Explain. mouse; A mouse is small. 56 paper clips would make about the same mass as a mouse.

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**1. Mass An animal has a mass of 56 grams. Is it a cat or a**

GUIDED PRACTICE for Examples 1, 2, and 3 1. Mass An animal has a mass of 56 grams. Is it a cat or a mouse? Explain. mouse; A mouse is small. 56 paper clips would make about the same mass as a mouse. Choose an appropriate metric unit to measure the item. 2. capacity of a wheelbarrow 3. mass of a test tube 4. mass of a car 5. capacity of a thermos

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**1. Mass An animal has a mass of 56 grams. Is it a cat or a**

GUIDED PRACTICE for Examples 1, 2, and 3 1. Mass An animal has a mass of 56 grams. Is it a cat or a mouse? Explain. mouse; A mouse is small. 56 paper clips would make about the same mass as a mouse. Choose an appropriate metric unit to measure the item. 2. capacity of a wheelbarrow liters 3. mass of a test tube grams 4. mass of a car kilograms 5. capacity of a thermos liters

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