Since we need your monthly bill we will call it the variable B for now, (Unless you have the bill, if so replace it with the variable) Multiply 1.64 x B since the exchange rate is different than the US bill, For example, say your bill is $100 in the U.S. You do 1.64 x 100 = A monthly bill of $164 if you lived in Britain
Division is repeated subtraction, just like multiplication is repeated addition. If you divide 50 by 10, you get 5. This is also the question: How many times do you have to subtract 10 from 50 to get 0?