Question

what number can you multiply each distance in the scale drawing by to find the actual distance? 3 cm : 1.5 km

Explanation:

Step1: Set up scale conversion

We know the scale is $3\ \text{cm} : 1.5\ \text{km}$. To find the multiplier, calculate $\frac{1.5}{3}$.
$\frac{1.5}{3} = 0.5$

Step2: Define the multiplier

This value means each cm on the map equals $0.5\ \text{km}$ in reality, so we multiply each map distance by $0.5$ (in km per cm) to get actual distance.

Answer:

0.5