The scale on a map is 1 cm = 10 miles. Find the length on the map of 300 miles

<-- Enter Map Scale Problem

The scale on a map is 1 cm = 10 miles. Find the length on the map of 300 miles

Our scale is 1 cm to 10 miles
We need to find how many cm exist in 300 miles, so we set up a proportion

Designate our missing cm measurement as x:
1 cm
10 miles
=
x
300 miles

Cross-Multiply:
10 miles(x) = 1 cm * 300 miles

Divide each side of the equation by 10 miles to isolate x:
10 miles(x)
10 miles
=
1 cm * 300 miles
10 miles

Cancel the miles measurement on the right side and simplify:
x =1 cm * 300 miles
10 miles

x =300 cm
10

x = 30 cm