500
To find out how many of anything are in a number, you need to divide. So for this case you divide 50,000 by 100. When dividing by numbers like 1000, 100, or 10. All you need to do is take away the same number of zeros. 100 has two 0s. Remove two 0s from 50,000 and you are left with 500. Therefore, there are 500 one hundreds in 50,000.