1. Unit Factor Method for Solving Problems3 = 1 1 3 = x 3 = 1

2. Units Factor, too! m = 1 1 m = x m = 1

3. 3m = 1 1 3m = x 3m = 1

4. 1 3m = x 3m 1 = 1

5. What is the problem asking?
How many grams are in 4 milligrams?
Conversion Factor
4mg =
1000mg 1g
0.004g
? g
quantity given by the problem
What is the problem asking?

6. How many hours are there in three days?=
? hr 3d 1d
24hr = 72
? hr

7. How many days are there in three hours?=
? d
3hr
24hr 1d = 3d 24 =
0.125 d
? d

8. 8 slices pizza = 12 people ? pizzas 2 slices person 3
You’ve decided to have a party for 12 of your friends.
You order pizza that has 8 slices per pizza.
How many pizzas do you need
if each person has 2 slices?
8 slices
pizza =
12 people
? pizzas
2 slices
person 3

9. = 3x108 m s ? m/d 60 s min 60 min hr d 24 hr 2.6x1013 m/d
The speed of light is about 300,000,000 meters per second,
written in scientific notation as 3.0x108 m/s.
How many meters does light travel in one day? =
3x108 m s
? m/d
60 s
min
60 min hr d
24 hr
2.6x1013 m/d

10. Given Unit
Desired Unit =
Given Unit
Desired Unit

11. 3x108 m 1,000 m 1 km 1.6093 km 1 mi = s 1.86x105 mi s = 60 s 1 min
How fast does light travel in miles/hour?
Now it’s your turn to try!
3x108 m
1,000 m
1 km km
1 mi = s
1.86x105 mi s =
60 s
1 min
60 min
1 hr
6.7x108
? mi/hr
1 mi = km