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1.[tex] \frac{4}{5} + \frac{1}{4} - \frac{1}{8} = \frac{32}{4 0 } + \frac{10}{40} - \frac{5}{40} = \frac{42}{40} - \frac{5}{40} = \frac{ 37}{40} [/tex]

2.[tex] \frac{7}{8} + \frac{3}{6} = \frac{21}{24} + \frac{12}{24} = \frac{33}{24} - \frac{2}{3} = \frac{33}{24} - \frac{16}{24} = \frac{17}{24} [/tex]

3.[tex] \frac{3}{4} - \frac{1}{2} + (\frac{2}{3} \times \frac{9}{4} ) = \frac{3}{4} - \frac{1}{2} + \frac{18}{12} = \frac{3}{4} - \frac{1}{2} + \frac{3}{2} \\ = \frac{3}{4} - \frac{2}{4} + \frac{6}{4} = \frac{7}{4} [/tex]

4.[tex] \frac{5}{6} \div \frac{10}{12} = \frac{5}{6} \times \frac{12}{10} = \frac{60}{60} = 1[/tex]

[tex] \frac{2}{3} - \frac{5}{8} + \frac{1}{1} = \frac{16}{24} - \frac{15}{24} + \frac{24}{24} = \frac{1}{24} + \frac{24}{24} = \frac{25}{24} = 1 \frac{1}{24} [/tex]

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