Posted by JRSutton on June 20, 2012 at 12:42:31 from (75.130.109.233):
In Reply to: Re: ANSWER KEY posted by kris Jensen on June 20, 2012 at 12:28:28:
Think you've got that backwards.
another way to look at is:
one third is equal to 1 divided by 3 which is .3333333
if you divide 50 by .3333333, you get 150
Add 7 to 150 you get the 157
It's more a word trick - you just assume if you're going to divide, and there's a fraction involved that the question is looking for the value of that fraction - in this case 1/3. It's easy to forget that to divide by a fraction it's a different process, and not often done.
to multiply 50 by 1/3...
50/1 * 1/3 = 50/3 or 16.66666
to divide fractions - you multiply by the inverse so to divide 50 by 1/3... invert the 1/3 to 3/1 and multiply.
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