30. Exemplar exercise problems XVIII

1. Select the rational numbers from the list which are also the integers.

 

$\frac{9}{4}$, $\frac{8}{4}$, $\frac{7}{4}$, $\frac{6}{4}$, $\frac{9}{3}$, $\frac{8}{3}$, $\frac{7}{3}$, $\frac{6}{3}$, $\frac{5}{2}$, $\frac{4}{2}$, $\frac{3}{1}$, $\frac{3}{2}$, $\frac{1}{1}$, $\frac{0}{1}$, $\frac{-1}{1}$, $\frac{-2}{1}$, $\frac{-3}{2}$, $\frac{-4}{2}$, $\frac{-5}{2}$, $\frac{-6}{2}$

 

2. Select those which can be written as a rational number with denominator $4$ in their lowest form:

 

$\frac{7}{8}$, $\frac{64}{16}$, $\frac{36}{-12}$, $\frac{-16}{17}$, $\frac{5}{-4}$, $\frac{140}{28}$