For example, if the first digit of a card number is a 7, the card is issued by an entity related to the petroleum industry, such as a gasoline brand.

Subtracting 4-digit numbers If you can subtract two 3-digit numbers from each other, then you can use the same method to subtract two 4-digit numbers.

Number columns allow you to take large numbers and subtract one from another. Find out more in this Bitesize Primary KS2 Maths guide.

A bank identification number (BIN) is the initial set of four to six numbers on a credit card that identifies the lending institution. It helps merchants track transactions.