1. Warm Up
Multiply the following by 1,000.
Divide the following by 1,000. 30
4,020
0.03
0.4871

2. Problem of the Day
James said he was 5 ft 6 in. tall. His brother’s height is 65 in. Who is the tallest and by how much?
James, by 1 in.

3. Learn to understand and select appropriate metric units of measure.

4. Vocabulary
metric system

5. The metric system of measurement is used almost everywhere in the world. Its advantage over the customary system is that all metric units are related by the decimal system.
Kilometer
Meter
Decimeter
Centimeter
Millimeter
Unit
Width of a single bed
1 m m
Distance around a city block
1,000 m km
Width of CD case
0.1 m dm
Width of a fingernail
0.01 m cm
Thickness of a dime
0.001 m mm
Benchmark
Relation to a Meter
Abbreviation
Metric Units of Length

6. Additional Example 1: Choosing Appropriate Units of Length
What unit of measure provides the best estimate? Justify your answer.
A. A ballpoint pen is about 14 _____ long.
Think: A ballpoint pen is about 14 times the width of a fingernail.
A ballpoint pen is about 14 cm long.
B. A football field is about 100 _____ long.
Think: A football field is about 100 times the width of a single bed.
A football field is about 100 m long.

7. Kilogram
Gram
Milligram
Unit
Textbook
1,000 g kg
Paper clip
1 g g
Very small insect
0.001 g mg
Benchmark
Relation to a Gram
Abbreviation
Metric Units of Mass

8. Additional Example 2: Choosing Appropriate Units of Mass
What unit of measure provides the best estimate? Justify your answer.
An orange has a mass of about 600 _____ .
Think: An orange has a mass of about 600 times the mass of a large paperclip.
An orange has a mass of about 600 g.

9. Metric Units of Capacity
Liter
Milliliter
Unit
Water pitcher
1 L L
Drop of water
0.001 L mL
Benchmark
Relation to a Liter
Abbreviation
Metric Units of Capacity

10. Additional Example 3: Choosing Appropriate Units of Capacity
What unit of measure provides the best estimate? Justify your answer.
An ice cream scoop holds about 100 _____ .
Think: An ice cream scoop holds the capacity of about 100 times a drop of water.
An ice cream scoop holds about 100 mL.

11. Additional Example 4: Finding Measurements
Use the ruler to measure the length of the line to the nearest centimeter.
1 m
The line is between 3 and 4 meters. Closer to 4 m than 3 m.
The length of the line is about 4 m.

12. Lesson Quiz
Name the most appropriate unit of measure.
1. A door knob has a diameter of about 7 _____.
2. A ballpoint pen weighs about 3 _____.
3. A gallon of milk is almost 4 _____.
4. Paul estimated the weight of his infant sister to t be 5 _____. cm g L kg

13. Lesson Quiz for Student Response Systems
1. Identify the most appropriate unit of measure. The wheel of a bicycle has a diameter of about 60 ___.
A. mm B. cm
C. m D. km

14. Lesson Quiz for Student Response Systems
2. Identify the most appropriate unit of measure. An adult rabbit weighs about 1 __.
A. mg B. g
C. kg D. L

15. Lesson Quiz for Student Response Systems
3. Identify the most appropriate unit of measure. A teapot has a capacity of almost 2 ___.
A. ml B. g
C. L D. kg

16. Lesson Quiz for Student Response Systems
4. Brian estimated the weight of a baseball bat to be 1 ___.
A. ml B. g
C. L D. kg