1. Day 61 – Unit Conversions

2. Vocabulary
Unit conversion is a changing of one unit to another. Metric units are the universally excepted units around the world (except for the US). They are the easiest to convert Conversion factors are relationships between units that we know to be true. Unit Examples: 1 minute = 60 seconds 12 inches = 1 foot 24 hours = 1 day

3. Steps to converting units
Write the number (with units) that you want to convert.
Multiply it by a conversion factor, written as a fraction.
Make sure the old units cancel.
Multiply all the numbers on the top and divide by the numbers on the bottom.

4. Example 1: Convert 1m to cm
For meters to cancel out, meters in the conversion factor must be on the opposite side of the fraction (fence). 1m
100 cm 1m
Given
Conversion Factor
Multiply every number on top of the fence and divide by the bottom.
(1 x 100) 1
= 100 cm

5. Example 2: 8765 mm to km
8765 mm
1 km
100,000 cm
10 mm
1 cm
(8765 x 1 x 1)
(10x100,000)
= km

6. Example 3. Convert 2miles/hour to km/min1
= km
1 mile
1 hr
60 min
(1 x 60) 1
=60 min
1 hr
3.218km
60 min
= km/min

7. 1.) 12,080 gallons per month into liters per hour
Try it on your own
1.) 12,080 gallons per month into liters per hour

8. 2.) 27 miles per gallon into kilometers per liter

9. 3.) 186,282 miles per second into meters per second

10. Answer Key
63.49 ltr/hr
11.5 km/ltr
x108 m/sec