a)
[tex]2 \frac{1}{3} = 1 \frac{2}{3} \\ 2 \frac{1}{3} - \frac{2}{3} = 1 \frac{4}{3} - \frac{2}{3} = 1 \frac{2}{3} [/tex]
b)
[tex]3 \frac{5}{8} = 2 \frac{7}{8} \\ \: \: {} \: 3 \frac{5}{8} - \frac{7}{8} = 2 \frac{6
13}{8} - \frac{7}{8} = 2 \frac{6}{8} = 2 \frac{3}{4} [/tex]
:)
