Derinda had 25 m of ribbon. She used it to make as many flowers as possible. She used $\frac{2}{3}$ m of ribbon to make each flower. How many metres of the ribbon were left? Ans: ___ m

1. Find the maximum number of flowers that can be made

Number of flowers = $25 \div \frac{2}{3} = 25 \times \frac{3}{2} = \frac{75}{2} = 37\frac{1}{2}$
Since she can only make whole flowers, she makes $37$ flowers.

2. Calculate the length of ribbon used and the length left

Ribbon used = $37 \times \frac{2}{3} = \frac{74}{3} = 24\frac{2}{3}$ m
Ribbon left = $25 - 24\frac{2}{3} = \frac{1}{3}$ m