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how do you divide 7/15 by 3/5
how do you figure out 7/15 by 3/5?
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asked
Oct 12, 2012
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Fraction Problems
by
anonymous
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1 Answer
Remember that dividing is equivalent to multiplying by the inverse of a number.
For instance, 10/5 = 2 and 10 * 1/5 = 2.
In this case (and all cases with whole numbers), changing inverting the denominator and multiplying is the same as dividing.
For your question:
 7/15 / 3/5 is equivalent to 7/15 * 5/3
 which is equivalent to (7 * 5 ) / (15 * 3)
 which is equivalent to (7 * 5) / (5 * 3 * 3)
 Cancelling out the two fives (5) on either side of the fraction leaves us with 7 / (3 * 3) or 7/9 (or .77 repeating )
To check with a calculator  try 7 / 15 / 0.6. You will get 0.77 repeating as well  7/9.
Hope that works.
Cheers Ken
answered
Oct 12, 2012
by
anonymous
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