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7) $\frac{17}{24} + \frac{25}{36} = \frac{51}{72} + \frac{50}{72} = \frac{101}{72} = 1\frac{29}{72}$ 8) $3\frac{7}{30} + 1\frac{9}{20} = 3\frac{14}{60} + 1\frac{27}{60} = 4\frac{41}{60}$ 9) $\frac{8}{27} + \frac{7}{18} = \frac{16}{54} + \frac{21}{54} = \frac{37}{54}$ 10) $2\frac{2}{3} + 1\frac{1}{2} = 2\frac{4}{6} + 1\frac{3}{6} = 3\frac{7}{6} = 4\frac{1}{6}$ 11) $\frac{16}{45} + 1\frac{7}{15} = \frac{16}{45} + 1\frac{21}{45} = 1\frac{37}{45}$ 12) $1\frac{3}{11} + 2\frac{2}{3} = 1\frac{9}{33} + 2\frac{22}{33} = 3\frac{31}{33}$ 13) $\frac{7}{8} + \frac{1}{3} = \frac{21}{24} + \frac{8}{24} = \frac{29}{24} = 1\frac{5}{24}$ 14) $2\frac{7}{16} + \frac{5}{32} = 2\frac{14}{32} + \frac{5}{32} = 2\frac{19}{32}$ 15) $1\frac{3}{4} + 4\frac{9}{10} = 1\frac{15}{20} + 4\frac{18}{20} = 5\frac{33}{20} = 6\frac{13}{20}$ 16) $3\frac{4}{7} + 1\frac{8}{11} = 3\frac{44}{77} + 1\frac{56}{77} = 4\frac{100}{77} = 5\frac{23}{77}$ 17) $\frac{7}{9} + 8\frac{13}{27} = \frac{21}{27} + 8\frac{13}{27} = 8\frac{34}{27} = 9\frac{7}{27}$