QR) what are the conversion i must know?

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They didn't provide conversion, and they usually don't provide conversions in that type of questions do they? 1 mile is 5280 feet, approximately 5000 feet. but 1 mile is 1760 yard, so if you know conversion from yard to feet (3 ft = 1 yard) then you shouldn't have a problem
 
I would keep temperature conversions fresh. Going between degrees C and degrees K isn't hard because they are proportional, but I would definitely know degrees F to degrees C and vise versa. I haven't taken the DAT so I can't speak from experience, for those who have taken the test.. Are temp conversions worth knowing?
 
According to Chad and destroyer problems, conversions are often given. Like the OP asked, I am curious about which ones we should know
 
3 feet = 1 yard
1 inch = 2.54 cm
5280 ft in 1 mile.
1760 yards = 1 mile
1lb = 16 ounces
1kg = 2.2 lbs
1 ton = 2000 lbs
1 meter = 40 inches. its 39.xx but 40 works.
1 cup = 8 fluid ounces = 1/2 pint = 1/4 quart = 1/16 gallon
F = 9/5C + 32

i think this should b enough. Anyone wanna add something else?
 
3 feet = 1 yard
1 inch = 2.54 cm
5280 ft in 1 mile.
1760 yards = 1 mile
1lb = 16 ounces
1kg = 2.2 lbs
1 ton = 2000 lbs
1 meter = 40 inches. its 39.xx but 40 works.
1 cup = 8 fluid ounces = 1/2 pint = 1/4 quart = 1/16 gallon
F = 9/5C + 32

i think this should b enough. Anyone wanna add something else?

That looks great - those are probably the highest yield conversions. Anything past that and you're probably just wasting your time.

On a random QR side note, make sure you know the equation for ellipses. I got one question on ellipses and I was glad I watched a Khan Academy video about them.
 
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