What is two fifths divided by one tenth?

Answer 1

Four.

How to do this:

You have two fractions:

2 1

-- --

5 10

The top number is the "numerator," the bottom the "denominator."

Take the second fraction and flip the numerator and denominator; this is called creating the reciprocal. So now we have these two fractions:

2 10

-- --

5 1

Next, multiply the two numerators: 2 x 10 = 20.

Next, multiply the two denominators: 5 x 1 - 5

Now create a fraction:

20

--

5

In this case you have created an "improper fraction"--the numerator's bigger than the denominator. So...let's reduce this down. 5/5 = 1, so 20/5 = 4.