Cards usually have the numbers in a groups of 4 digits. When typing into a field let me type in same groups of 4 digits. It is easier to see that there are 4 gr

Cards usually have the numbers in a groups of 4 digits. When typing into a field let me type in same groups of 4 digits. It is easier to see that there are 4 groups of 4 digits each, as opposed to counting a blur of 16 digits.