[tex]a) \frac{3}{4} + \frac{5}{8} = \frac{3 \times 2}{4 \times 2} + \frac{5}{8} = \frac{6}{8} + \frac{5}{8} = \frac{6 + 5}{8} = \frac{11}{8} = 1 \frac{3}{8} [/tex]
[tex]b) \frac{7}{12} + \frac{2}{3} = \frac{7}{12} + \frac{2 \times 4}{3 \times 4} = \frac{7}{12} + \frac{8}{12} = \frac{7 + 8}{12} = \frac{15}{12} ^{(3} = \frac{5}{4} = 1 \frac{1}{4} [/tex]
