2. “Easy” Mental Conversions How many inches in a foot? How many seconds in a minute? How many centimeters in a meter?

3. “Not-So-Easy” Mental Conversions How many centimeters in a kilometer? How many liters in a gallon? How many kilograms in a pound?

4. “Killer” Mental Conversions How many inches in a kilometer? How many cups in a liter? How many ounces in a kilogram?

6. SAME divided by SAME = 1 RULE #1

7. 12 in 1 ft 2.54 cm 1 in 1.609 km 1 mi 60 sec 1 min 24 hr 1 day 1 mi 5280 ft 1 yr 365 days 1 kg 2.2 lbs 100 cm 1 m “Fancy Ones” ** The key to unit factoring **

8. THING x 1 = THING RULE #2

9. If there is same thing in the numerator and the denominator, they will cancel. RULE #3 3 x 1 24 y 1 x 60 z 1 y =

10. Using it Now How many seconds in 7 minutes? Start with what you have… 7 min What units do you want to get? =_________ sec Multiply by unit factor (fancy one) to cancel units you don’t want and get the units you do want 60 sec 1 min Do the math (fraction rules) to get the answer 420

11. A five gallon bucket could hold how many liters? 1 gallon = 3.8 Liters

12. How many feet in 1 meter?... 1 inch = 2.54 cm

13. How many centimeters in 1 mile?... 1 mile = 5280 ft 1 inch = 2.54 cm