Map scale 1 mm : 2 m, 35 mm on the map

Step by step

The question

Question: with the scale 1 mm : 2 m, how long is 35 mm on the map for real?

The scale means: 1 mm on the map is 2 m for real.

1 Multiply both sides

On the map we have 35 mm.

That is 35 times 1 mm.

So the real length is 35 times 2 m too.

We multiply both sides by the same number, 35.

2 times 35 is 70.

So the real length is 70 m.

2 Check

Let's check: go back.

70 divided by 2 should give the map length, 35.

We get it again.

So 70 m is right!

Let's look back.

First: multiply both sides.

Last: check.