€1 = $1.20. Change $90 to euros.

Step by step

The question

Question: change $90 to euros, when €1 = $1.20.

1 Write the rate

The rate says: 1 euro is worth 1.20 dollars.

From euros to dollars, we multiply by 1.20.

Going back, we divide by 1.20.

2 Divide by the rate

Each €1 gives $1.20.

So we find how many $1.20 fit in $90: we divide by 1.20.

Careful!

From dollars back to euros goes the other way.

We divide, not multiply.

90 divided by 1.20 is €75.

To divide by 1.20, we move the point in both numbers 2 places: 9000 divided by 120.

So $90 is €75.

3 Check

Let's check: change the answer back.

€75 times 1.20 is $90.

That is what we started with.

So the answer is right!

Let's look back.

First: write the rate.

Then: divide by the rate.

Last: check.