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Estimating Length and Measuring Mass with Metric Units

Learn how to estimate length using paper clips and measure mass with benchmarks and metric units. Practice examples provided for better understanding.

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Estimating Length and Measuring Mass with Metric Units

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  1. About 5 large paper clips fits next to the bandage, so it is about 5 centimeters long. EXAMPLE 1 Using Metric Units of Length Estimate the length of the bandage by imagining large paper clips laid next to it. Then measure the bandage with a metric ruler to check your estimate. STEP 1 Estimate using large paper clips.

  2. Each centimeter is divided into tenths, the bandage is 4.8 centimeters long. EXAMPLE 1 Using Metric Units of Length Estimate the length of the bandage by imagining large paper clips laid next to it. Then measure the bandage with a metric ruler to check your estimate. STEP 2 Measure using a ruler.

  3. EXAMPLE 2 Measuring Mass Find the mass of the apples.

  4. 1 kilogram textbook 1 gram small paper clip 1 milligram grain of sugar EXAMPLE 2 Measuring Mass Mass Benchmarks You can use the following benchmarks to estimate mass.

  5. The mass of a CD is 16 ? . ANSWER The mass of a CD is 16 grams. EXAMPLE 3 Using Metric Units of Mass Copy and complete using the appropriate metric unit: The mass of a CD is greater than the mass of 16 grains of sugar (16 mg), and it is less than the mass of 16 textbooks (16 kg). Because a good estimate for the mass of a CD is 16 paper clips, the appropriate metric unit is grams.

  6. ANSWER ANSWER 7.7 cm between 0 kg and 1 kg ( at about 0.75 kg ) GUIDED PRACTICE for Examples 1, 2 and 3 1. What If? Suppose you estimate with paper clips that a larger bandage is about 8 centimeters long. Is its actual length more likely to be 7.2 centimeters or 7.7 centimeters? 2. What If? Suppose there were only 3 apples on the scale in Example 2. Describe where the pointer would point relative to the 1 kg mark.

  7. 4.The mass of a tack is 200 ? . 3.The mass of a baby is 4 ? . kg mg ANSWER ANSWER GUIDED PRACTICE for Examples 1, 2 and 3 Copy and complete using the appropriate metric unit.

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