[tex] \frac{5}{72} \times \frac{3}{24} + \frac{7}{36} = \frac{15}{1728} + \frac{7}{36 } = \frac{15}{1728} + \frac{336}{1728} = \frac{351}{1728} [/tex]
[tex]3 \frac{1}{3} + 4 \frac{1}{7} + \frac{2}{21} = \frac{10}{3} + \frac{29}{7} + \frac{2}{21} = \frac{70}{21} + \frac{87}{21} + \frac{2}{21} = \frac{159}{21} [/tex]
[tex] \frac{1}{3} + \frac{5}{18} + \frac{2}{9} + \frac{4}{27} = \frac{18}{54} + \frac{15}{54} + \frac{12}{54} + \frac{8}{54} = \frac{53}{54} [/tex]
[tex]3 \frac{ 1}{35} + 2 \frac{1}{10} + \frac{9}{10} = \frac{106}{35} + \frac{21}{10} + \frac{9}{10} = \frac{212}{70} + \frac{147}{70} + \frac{63}{70} = \frac{212 + 147 + 63}{70} = \frac{422}{70} [/tex]
