Question

Question 4.
Which of the following is not in the lowest form?
(a) $\frac{7}{5}$
(b) $\frac{15}{20}$
(c) $\frac{13}{33}$
(d) $\frac{27}{28}$

Answer 1

(b)

We know that a fraction is in its lowest form if the HCF of their numerator and denominator is 1. Now,
(a) $\frac{7}{5}$
Since HCF of 7 and 5 is 1. So, it is in its lowest form.
(b) $\frac{15}{20}$
Since HCF of 15 and 20 is 5. So, it is not in its lowest form.
(c) $\frac{13}{33}$
Since HCF of 13 and 33 is 1. So, it is in its lowest form.
(d) $\frac{27}{28}$
Since HCF of 27 and 28 is 1. So, it is in its lowest form.
Hence, option (b) is not in the lowest form.