Step by step
The question
Question: change €60 to dollars, when $1 = €0.80.
1 Write the rate
The rate says: 1 dollar is worth 0.80 euros.
From dollars to euros, we multiply by 0.80.
Going back, we divide by 0.80.
2 Divide by the rate
Each $1 gives €0.80.
So we find how many €0.80 fit in €60: we divide by 0.80.
Careful!
From euros back to dollars goes the other way.
We divide, not multiply.
60 divided by 0.80 is $75.
To divide by 0.80, we move the point in both numbers 2 places: 6000 divided by 80.
So €60 is $75.
3 Check
Let's check: change the answer back.
$75 times 0.80 is €60.
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.