$1 = £0.79. Change £20 to dollars.

Step by step

The question

Question: change £20 to dollars, when $1 = £0.79.

1 Write the rate

The rate says: 1 dollar is worth 0.79 pounds.

From dollars to pounds, we multiply by 0.79.

Going back, we divide by 0.79.

2 Divide by the rate

Each $1 gives £0.79.

So we find how many £0.79 fit in £20: we divide by 0.79.

Careful!

From pounds back to dollars goes the other way.

We divide, not multiply.

20 divided by 0.79 is about $25.32.

To divide by 0.79, we move the point in both numbers 2 places: 2000 divided by 79.

Money goes to the cent.

So £20 is about $25.32.

3 Check

Let's check: change the answer back.

$25.32 times 0.79 is about £20.

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.