Map scale 1 cm : 2 km, 6 cm on the map

Step by step

The question

Question: with the scale 1 cm : 2 km, how long is 6 cm on the map for real?

The scale means: 1 cm on the map is 2 km for real.

1 Multiply both sides

On the map we have 6 cm.

That is 6 times 1 cm.

So the real length is 6 times 2 km too.

We multiply both sides by the same number, 6.

2 times 6 is 12.

So the real length is 12 km.

2 Check

Let's check: go back.

12 divided by 2 should give the map length, 6.

We get it again.

So 12 km is right!

Let's look back.

First: multiply both sides.

Last: check.