A carpenter needs 80cm of wood he cuts this from a plank 2cm long. What fraction did he use?
Solve
25cm
2/80 = 1/40
To determine the fraction of the plank that the carpenter used, we need to divide the length of wood he needed (80 cm) by the length of the plank he cut from (2 cm).
80 cm ÷ 2 cm = 40
The carpenter used 40 planks to get 80 cm of wood. Therefore, the fraction of the plank he used is 40/1 or simply 40.