Multiple choice general knowledge All Master cards start with anyone of the following number 4 3 5 None of the above Reveal answer Fill a bubble to check yourself C Correct answer Explanation All Mastercard credit and debit cards begin with the number 5, specifically with the IIN/BIN range 51-55. This is part of the ISO/IEC 7812 standard for card numbering. Visa cards start with 4, American Express with 34 or 37, and Discover with 6011.