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

(a) \( \dfrac{9}{4} \; \square \; \dfrac{9}{13} \)

(b) \( \dfrac{3}{8} \; \square \; \dfrac{3}{15} \)

(c) \( \dfrac{5}{15} \; \square \; \dfrac{6}{15} \)

(d) \( \dfrac{10}{9} \; \square \; \dfrac{9}{9} \)

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

(a) \( \dfrac{9}{8} \; \square \; \dfrac{54}{84} \)

(b) \( \dfrac{7}{10} \; \square \; \dfrac{4}{6} \)

(c) \( \dfrac{9}{13} \; \square \; \dfrac{13}{30} \)

(d) \( \dfrac{12}{12} \; \square \; \dfrac{9}{38} \)