1. Friday, October 23, 2015

2. Unit Multipliers/Dimensional Analysis (Saxon) (Glencoe) Converting units by using using unit multipliers (which is dimensional analysis)

3. Compute mentally:

4. What are units? Units-- the words we attach to numbers. Examples: 3 feet10 inches 5 meters Denominate number -- the number Units -- the word

5. What are units? Write the units on your white board. 4 yards 8 miles per hour 5,280 feet

6. U.S. Customary System The basic units of measure we use for length are related in the following ways: 12 inches = 1 foot 3 feet = 1 yard 5,280 feet = 1 mile You should memorize these!

7. U.S. Customary System The basic units of measure we use for weight are related in the following ways: 16 ounces = 1 pound 2,000 pounds = 1 ton You should memorize these!

8. What happens if you multiply something by a fraction that equals 1?

9. What would number would make each fraction equal to 1?

10. Unit Multipliers

11. Unit Multipliers can be written two ways.

12. Using Unit Multipliers Unit multiplier Unit multiplier

13. 5 ft12 in 1 1 ft Notice that the units “ft” cancel. Yes, you can think this through without a unit multiplier. “I know there are 12 inches in every foot, so if I have 5 feet I will have 5 times 12 inches. However, for this assignment, USE unit multipliers. And…SHOW YOUR WORK!!!!!!!!!!!! = 60 inches

14. Another example:

16. What if? What if we had used the unit multiplier with yards on the bottom? 420 ft 3 ft 1 1 yd = 1260 ft ft 1 yd

17. Your Turn on the White Board Use a unit multiplier to convert 72 inches to feet. Answer: 6 ft

18. Your Turn on the White Board Use a unit multiplier to convert 4.6 miles to feet. Answer: 24,288 ft

19. Your Turn on the White Board Use a unit multiplier to convert 4 tons to pounds. Answer: 8000 lb

20. Classwork Time Show your work with unit multipliers even if you can convert these in your head. x What you have (number and units) Units you have Units you desire 1