1. Objective: To use the metric and English systems to measure length
9.1 Measuring Length
Objective: To use the metric and English systems to measure length

2. English Units of length
Common units of length are inches(in), feet(ft), yards(yd) and miles(mi)
Use the following table to convert
To change from smaller to larger – divide
To change from larger to smaller - multiply
1 foot
12 inches
1 yard
3 feet or 36 inches
1 mile
5,280 ft or 1,760 yd

3. Examples 8yd = _________ft 72in = _________yd 3ft = ________ in
2mi = _______ft
Convert 50 inches to feet and inches
Convert 23 ft into yards and feet

4. The Metric System
The metric system is a base ten system just like our number system.
The metric system has standard units of measure and prefixes.
The standard unit of length is a meter (m)

5. Prefixes Symbol Unit Meaning km kilometer 1000 meters hm hectometer
dam
dekameter
10 meters m
meter
1 meter dm
decimeter
0.1 meter cm
centimeter
0.01 meter mm
millimeter
0.001 meter

6. Converting
To change to a smaller unit – multiply by powers of 10 or move decimal to right
To change to a bigger unit – divide by powers of 10 or move decimal to left

7. Examples 6.5 m = ________mm 7.2 dam = _________cm
82.4 m = __________hm
756 km = ________m
24m = _________dm

8. Metric and English equivalents
1 inch = 2.54 cm
1 foot = cm
1 yard m
1 mile km

9. Examples 8 inches = _____centimeters 125 miles = _______ kilometers
26,800 millimeters = _______ inches

10. Homework
P.469/1-44