Question

Which of the following is not in the lowest form?

Options

• `7/5`

• `15/20`

• `13/33`

• `27/28`

Answer 1

`bb(15/20)`

Explanation:

We know that, a fraction is in its lowest form, if the HCF of their numerator and denominator is 1. Now,

a. `7/5`

Since, HCF of 7 and 5 is 1.

So, it is in its lowest form.

b. `15/20`

Since, HCF of 15 and 20 is 5.

So, it is not in its lowest form.

c. `13/33`

Since, HCF of 13 and 33 is 1.

So, it is in its lowest form.

d. `27/28`

Since, HCF of 27 and 28 is 1.

So, it is in its lowest form.

Hence, `15/20` is not in the lowest form.