The document discusses measures of length and converting between units of length in the metric system. It defines common units of length like meters, centimeters, kilometers, and provides examples for converting between units. For example, it states that 1 km equals 1000 meters, and shows examples of conversion calculations like converting 6 km to meters by multiplying 6 x 1000.

1. Wednesday, July 12 2023
Measures of Length
Objectives:
• Measure objects according to appropriate
unit of linear measure.
• Convert common units of length from
larger to smaller unit and vice versa.

2. Measures of Length

3. Length matters!

4. • Length is how long something is.
• We use different devices to measure
lengths such as the ruler, meter stick and
tape measure.
• Meter(m) is the standard unit of length in
the metric system.
• We use units related to meter for shorter
lengths, namely millimeter (mm),
centimeter (cm), and decimeter (dm).
• We use kilometer (km) for long distances.

5. How will I
know which
unit of length
is appropriate
to use?

7. Estimating Lengths
30 cm
2 m

8. Estimating Lengths
30 cm
2 m

9. Estimating Lengths
300 cm
55 km

10. Estimating Lengths
300 cm
55 km

11. Estimating Lengths
10 m
8 cm

12. Estimating Lengths
10 m
8 cm

13. Estimating Lengths
5 mm
4 m

14. Estimating Lengths
5 mm
4 m

15. Estimating Lengths
40 cm
5 km

16. Estimating Lengths
40 cm
5 km

17. Estimating Lengths
6 km
8 m

18. Estimating Lengths
6 km
8 m

19. Estimating Lengths
2 cm
20 m

20. Estimating Lengths
2 cm
20 m

21. Conversion
of units of
length

22. Metric System Units of Length
km: kilometer
hm: hectometer
dam: decameter
m: meter
dm: decimeter
cm: centimeter
mm: millimeter

23. Conversion Facts ( Length)
• 1 km = 1000m
• 1 m = 1 000mm
• 1 m = 100 cm
• 1 m =10 dm
• 1 dm = 10 cm
• 1 cm = 10 mm

24. Convert length measures using
operations
We can change one unit of length
measurement to another.
• Bigger unit to smaller unit,
multiply
• Smaller unit to bigger unit,
divide

25. Example 1
Convert:
6 km to meters
Solution:
6 x 1 000 = 6 000
Answer:
6 km = 6 000 meters
Conversion fact:
1 km = 1000 m

26. Example 2
Convert:
8 m to centimeters
Solution:
8 x 100 = 800
Answer:
8 m = 800 centimeters
Conversion fact:
1 m = 100 cm

27. Example 3
Convert:
3 000 m to kilometer
Solution:
3000 ÷ 1000 = 3
Answer:
3 000 m = 3 kilometers
Conversion fact:
1 km = 1000 m

28. Example 4
Convert:
9 000 mm to meter
Solution:
9000 ÷ 1000 = 9
Answer:
9 000 mm = 9 meters
Conversion fact:
1 m = 1000 mm

29. Textbook Practice
Practice on page 9
• Practice 3 Converting Measurements