5000 x 100 = 500000
5000 x 100 = 500000. Multiplying by a hundred adds two zeros, and 5,000 brings three of its own, so the answer carries five. That total is exactly half a million.
5,000 × 100 = 500,000
Adding 5,000 to itself 100 times gives the same answer.
Why the answer is 500,000
Multiplying by 100 adds two zeros to a whole number. 5,000 ends in three zeros already, so 5,000 x 100 ends in five: 500,000. The digit 5 never moves, which is what makes hundreds and thousands quick to do in your head.
500,000 is half a million
Half of 1,000,000 is 500,000, so this page is the halfway mark to 1,000 x 1,000 = 1,000,000. If a figure is written as 0.5 million or 500K, it is this number.
The same answer from a different pair
500 x 1,000 = 500,000 as well. One factor lost a zero and the other gained one, so the product held still.
The sum this gets confused with
500 x 100 = 50,000, which is ten times smaller. The two look alike at a glance and the extra zero in 5,000 is easy to skip when you are copying a figure out of a spreadsheet.
A feel for the size
500,000 seconds is 5 days, 18 hours, 53 minutes and 20 seconds, so half a million seconds is under a week. Other pairs are indexed on multiplication answers.