Simple. Divide the whole number by the bottom number of the fraction (denominator) and then multiply by the top (numerator).
Example: 2/5 of 20 is 8. Divide 20 by 5(which is 4)then multiply by 2(which is 8). Simple.
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First you would have to turn 3.25 into a fraction (3 1/4). To find the improper fraction you would multiply the denominator (4) by the whole number (3) to get 12 and then add the neumerator (1). The final improper fraction would be 13/4.
To simplify a fraction, you find a number that can be divided by the fraction you are simplifying. sometimes this does not always work and the fraction can not be simplified.
Any whole number can be expressed as a fraction by putting it over 1.
You switch its numerator(top number) with its denominator(Bottom number)
you find the highest number that goes into both the numerator and the denominatior and divide both by that number.