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

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Presentation transcript:

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

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

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

SAME divided by SAME = 1 RULE #1

12 in 1 ft 2.54 cm 1 in 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 **

THING x 1 = THING RULE #2

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 =

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

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

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

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