Question

How do you determine which of the fractions `17/20` or `21/25` is greater and by how much?

Answer 1

`17/20` is greater by `1/100`

Explanation:

Put them over the same denominator using equivalent fractions

`17/20=85/100`

`21/25=84/100`

Answer 2

`17/20` is bigger than `21/25` by `1/100`

Explanation:

Subtract the fractions.
If you get a positive answer the first one is bigger, if you get a negative answer, the second one is bigger.

To subtract them you need the LCD which is `100` in this case.

`17/20-21/25`

`= (85-84)/100`

`=1/100`

`:. 17/20` is bigger than `21/25` by `1/100`