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$\frac{1}{12} + \frac{3}{4} = \frac{1}{12} + \frac{9}{12} = \frac{10}{12} = \frac{5}{6}$

__________

$2 \frac{1}{4} \div \frac{1}{6} = \frac{9}{4} \div \frac{1}{6} = \frac{9}{4} \times \frac{6}{1} = \frac{54}{4} = \frac{27}{2}$

27 / 2 = 13 1/2

__________

$2 - 1\frac{3}{7} = \frac{2}{1} - \frac{10}{7} = \frac{14}{7} - \frac{10}{7} = \frac{4}{7}$

__________

$12 \times \frac{3}{4} = 3 \times 3 = 9$