1. Rules for Converting Units
Units cancel in division.
Units combine in multiplication.
Units stay the same in addition and subtraction.

2. What is a Conversion Factor?
A ratio written in fraction form that can express the same value or quantity in two different units.
Conversion Factors are going to essentially equal one.
Any number multiplied by one does not change.

3. Assignment
Come up with 5 conversion factors not mentioned on the previous slide.

4. Steps to Converting Units
Start with the unit you want to change.
Multiply it by a blank fraction.
The unit you want to change goes in the denominator.
The unit you want to convert into goes into the numerator.
Insert the values for your conversion factor.
Solve the problem.

5. How many inches are there in 50 feet?
Start with the unit you want to change.
Multiply it by a blank fraction.
The unit you want to change goes in the denominator.
The unit you want to convert into goes into the numerator and answer.
Insert the values for your conversion factor.
Solve the problem.

6. How many inches are there in 50 feet?
Start with the unit you want to change.
Multiply it by a blank fraction.
The unit you want to change goes in the denominator.
The unit you want to convert into goes into the numerator and answer.
Insert the values for your conversion factor.
Solve the problem. 12 =
600 50 x in in ft 1 ft

7. How many feet is 744 inches? Start with the unit you want to change.
Multiply it by a blank fraction.
The unit you want to change goes in the denominator.
The unit you want to convert into goes into the numerator and answer.
Insert the values for your conversion factor.
Solve the problem.

8. 744 How many feet is 744 inches? in
Start with the unit you want to change.
Multiply it by a blank fraction.
The unit you want to change goes in the denominator.
The unit you want to convert into goes into the numerator and answer.
Insert the values for your conversion factor.
Solve the problem.
744 in

9. 744 x How many feet is 744 inches? in
Start with the unit you want to change.
Multiply it by a blank fraction.
The unit you want to change goes in the denominator.
The unit you want to convert into goes into the numerator and answer.
Insert the values for your conversion factor.
Solve the problem.
744 x in

10. = 744 x How many feet is 744 inches? ft ft in in
Start with the unit you want to change.
Multiply it by a blank fraction.
The unit you want to change goes in the denominator.
The unit you want to convert into goes into the numerator and answer.
Insert the values for your conversion factor.
Solve the problem. =
744 x ft ft in in

11. = 1 744 12 x How many feet is 744 inches? ft ft in in
Start with the unit you want to change.
Multiply it by a blank fraction.
The unit you want to change goes in the denominator.
The unit you want to convert into goes into the numerator and answer.
Insert the values for your conversion factor.
Solve the problem. 1 =
744 x ft ft in 12 in

12. = 1 62 744 12 x How many feet is 744 inches? ft ft in in
Start with the unit you want to change.
Multiply it by a blank fraction.
The unit you want to change goes in the denominator.
The unit you want to convert into goes into the numerator and answer.
Insert the values for your conversion factor.
Solve the problem. 1 = 62
744 x ft ft in 12 in

13. Unit you are changing into
Unit you want to change
Unit you are changing into = x
Conversion
Factor

14. How many seconds are 40 minutes?
Start with the unit you want to change.
Multiply it by a blank fraction.
The unit you want to change goes in the denominator.
The unit you want to convert into goes into the numerator and answer.
Insert the values for your conversion factor.
Solve the problem.
2400

15. How many seconds are 40 minutes?
Start with the unit you want to change.
Multiply it by a blank fraction.
The unit you want to change goes in the denominator.
The unit you want to convert into goes into the numerator and answer.
Insert the values for your conversion factor.
Solve the problem. =
2400 x

16. How many cups are in 4.5 gallons?
Start with the unit you want to change.
Multiply it by a blank fraction.
The unit you want to change goes in the denominator.
The unit you want to convert into goes into the numerator.
Insert the values for your conversion factor.
Solve the problem.
2400

17. How many eggs are in 15 dozen?
Start with the unit you want to change.
Multiply it by a blank fraction.
The unit you want to change goes in the denominator.
The unit you want to convert into goes into the numerator.
Insert the values for your conversion factor.
Solve the problem.
2400

18. How many dozen is 89 eggs? Start with the unit you want to change.
Multiply it by a blank fraction.
The unit you want to change goes in the denominator.
The unit you want to convert into goes into the numerator.
Insert the values for your conversion factor.
Solve the problem.
2400

19. How many seconds are in 3 hours?
Start with the unit you want to change.
Multiply it by a blank fraction.
The unit you want to change goes in the denominator.
The unit you want to convert into goes into the numerator.
Insert the values for your conversion factor.
Solve the problem.
2400

20. A swimming pool holds 10,000 gallons of water and one gallon of water weighs 8lbs. What is the weight of the water in the pool?
Start with the unit you want to change.
Multiply it by a blank fraction.
The unit you want to change goes in the denominator.
The unit you want to convert into goes into the numerator.
Insert the values for your conversion factor.
Solve the problem. =
2400 x

21. How many seconds are in 3 hours?
Start with the unit you want to change.
Multiply it by a blank fraction.
The unit you want to change goes in the denominator.
The unit you want to convert into goes into the numerator.
Insert the values for your conversion factor.
Solve the problem.
2400

22. How many seconds are in 3 hours?
Start with the unit you want to change.
Multiply it by a blank fraction.
The unit you want to change goes in the denominator.
The unit you want to convert into goes into the numerator.
Insert the values for your conversion factor.
Solve the problem.
3 Hours  Minutes
That number of Minutes  Seconds
2400

23. Assignment
Unit Conversions Handout
2400