Question

how many pieces of string that are 2/7 of an inch long can be cut from a piece of string that are 7/8 of an inch long

Answer 1

namely, how many times does 2/7 go into 7/8?

$\bf \cfrac{7}{8}\div\cfrac{2}{7}\implies \cfrac{7}{8}\cdot \cfrac{7}{2}\implies \cfrac{49}{16}\implies 3\frac{1}{16}\impliedby \textit{3 whole times}$