Solve Complex Fraction Problem: 3½ - (1/3)÷(1/6)

Question

3121316= 3\frac{1}{2}-\frac{\frac{1}{3}}{\frac{1}{6}}=

Video Solution

Step-by-Step Solution

When we have a fraction over a fraction, in this case one-third over one-sixth, we can convert it to a form that might be more familiar to us:

1/3:1/6 1/3 : 1/6

It's important to remember that a fraction is actually another sign of division, so the exercise we have is one-third divided by one-sixth.
When dealing with division of fractions, the easiest method for solving is performing "multiplication by the reciprocal", meaning:

1/3×6/1 1/3\times6/1

Multiply numerator by numerator and denominator by denominator and get:

63 \frac{6}{3}

Which when reduced equals

21 \frac{2}{1}

Now let's return to the original exercise, to solve it we need to take the mixed fraction and convert it to an improper fraction,
meaning move the whole numbers back to the numerator.

To do this we'll multiply the whole number by the denominator and add to the numerator

3×2=6 3\times2=6

6+1=7 6+1=7

And therefore the fraction is:

72 \frac{7}{2}

Now we want to do the subtraction exercise, but we see that we have another step on the way.
We subtract fractions when both fractions have the same denominator,
so we'll expand the fraction 21 \frac{2}{1} to a denominator of 2, and we'll get:

42 \frac{4}{2}

And now we can perform subtraction -

7242=32 \frac{7}{2}-\frac{4}{2}=\frac{3}{2}

We'll convert this back to a mixed fraction and we'll see that the result is

Answer

112 1\frac{1}{2}