Question

A 9-foot piece of wood is cut into shelves. If each is 3/7 foot in length, how many shelves are there?

Answer 1

Hello!

To find how much shelves we cut, we need to divide 9 feet by 3/7 feet. When dividing by fractions, it is like multiplying its reciprocal.

This means that the reciprocal of 3/7 is 7/3.

$9 / \frac{3}{7} = \frac{9}{1} * \frac{7}{3} = \frac{63}{3} = 21$

Therefore, if each shelf is 3/7 feet in length, then there are 21 shelves.