1. Conversions with Factor Label
How to change Faces into Turtles

2. Practice Sig Figs How many sig figs in:
100
11010
11.010
104,000
104,000. 1 4 5 3 4 3 6

3. Factor Label Method Line up the units so they cancel out
Example problem
How many feet in 120 inches?
There are 12in in a foot
This can be written in or foot foot in
So the problem looks like
120 inches x 1 foot = inches
120 ft = 10. ft 12

4. Conversions
Use conversion “factors” to trade from one type of unit to the other.
Just make sure the desired units are in the right place

5. Convert 300.9 grams to pounds
How many sig figs in data? 4
How many sig figs in answer?
What are units of answer?
pounds
What are the units of the conversion factor?
Grams x pounds = pounds grams
Put in numbers
300.9 grams x 1 pounds = pounds grams

6. Convert 1.02 lbs to grams 454g = 1.000 lbs
How many sig figs in answer?
What are the units of the answer?
What are the units of the conversion factor?
lbs x grams = grams lbs
Put in numbers
1.013 lbs x grams = grams lbs

7. How About Other Practice
How many sig figs in answer?
What are the units of the answer?
What are the units of the conversion factor?
Liters to gallons
There are L in a gallon
_______ x _______ = gallons

8. How many joules in 3.57 kilojoules?
How many megapascals in x 104 centipascals?
3.57 x 103
3.78 x 10-4
Use agenda for conversion factors

9. Derived Units More than one unit in a number
Density is a great example
Grams per milliliter
g/ml
Two units
How about lbs / gal to g / ml
454g / lbs and ml / gal
Just do two conversions
Ready for another problem

10. How about lbs/gal to g/ml ?
X 454 g
1 lbs
X 1 gal
3785 ml
= 1.02 g ml

11. How about lbs/gal to g/ml ?
X g ?
X 454 g
1 lbs
X 1 gal
3785 ml
X ? ?
= 1.02 g ml

12. Convert mpg to kpl 100.0 miles to Km gallon liter
100.0 mpg = ? Km per l
Data
3.85 liters in a gallon
1.61 km in a mile
Answer
Is ……
miles X Km x 1 gallon = km
gallon mile liter liter

13. How many milliliters in 3.52 gallons? How many teaspoons in 13 cups?
3.85 liters in a gallon cups in a gallon 2.54 cm in an inch oz in a pound 0.454kg in a pound tablespoons in a cup 3 teaspoons in a tablespoon
How many liters in 4.98 cups?
How many cm’s in 3.56 x 103 feet?
How grams in 2.05 pounds?
How many milliliters in 3.52 gallons?
How many teaspoons in 13 cups?
How many Tons in 1.53 x 106 oz.?
How many Kilograms in 1.53 x 106 oz?