(1) Compare the fractions (insert the sign (<), (>) or (=)):

(a) \( \dfrac{4}{4} \; \square \; \dfrac{4}{21} \)

(b) \( \dfrac{4}{6} \; \square \; \dfrac{4}{13} \)

(c) \( \dfrac{8}{13} \; \square \; \dfrac{6}{13} \)

(d) \( \dfrac{12}{8} \; \square \; \dfrac{16}{8} \)

(2) Compare the fractions (insert the sign (<), (>) or (=)):

(a) \( \dfrac{9}{12} \; \square \; \dfrac{42}{84} \)

(b) \( \dfrac{6}{8} \; \square \; \dfrac{3}{10} \)

(c) \( \dfrac{6}{14} \; \square \; \dfrac{10}{30} \)

(d) \( \dfrac{14}{13} \; \square \; \dfrac{11}{40} \)