3per8+5per6-2per3=....

[tex] \frac{3}{8} [/tex] + [tex] \frac{5}{6} [/tex] - [tex] \frac{2}{3} [/tex] =
[tex] \frac{9+20-16}{24} [/tex] =

3/8 + 5/6 - 2/3 =
(3.6 + 8.5)/6.8 - 2/3 =
(18 + 40)/48 - 2/3 =
58/48 - 2/3 =
29/24 - 2/3 =
(29.3 - 24.2)/24.3 =
(87 - 48)/72 =
39/72 = 13/24