What is 5,100 in decimal form?

Im pretty sure that it would just be its self

The answer is 51 because if u moved the decimal (which is at the end of the number) to the left twice (because it's actually dividing by a 100) the decimal will stop at 51.00, u really don't need the zeroes because it still the same number without the zeroes also u can read it and u will see it's the same number.