Question

Marco is measuring two pieces of strings. One piece of string is 15 cm long. The other string is 250 mm long. In centimeters, how long are the pieces of strings together?

Answer 1

Determine the length of string together.

$\begin{gathered} L=15\text{ cm+250 mm}\times\frac{1\text{ cm}}{10\text{ mm}} \\ =15\text{ cm+25 cm} \\ =40\text{ cm} \end{gathered}$

So, length of string together is 40 cm.