Question

what is 2/5 + 3/7 in the LCD way

Answer 1

$\frac{2}{5} + \frac{3}{7} = \frac{2\times 7}{5\times 7} + \frac{3\times 5}{7\times 5}= \frac{14}{35} + \frac{15}{35}= \frac{14+15}{35} = \huge{\boxed{\frac{29}{35}}}$