15 x 1000 = 15000
15 times 1000 is 15000. Multiplying by 1000 shifts every digit three places to the left, so 15 becomes fifteen thousand. The working, a faster mental route and a live calculator follow.
15 × 1,000 = 15,000
Adding 15 to itself 1,000 times gives the same answer.
15 x 1000 = 15000
Multiplying a whole number by 1000 adds three zeros, so 15 becomes 15,000. Spoken, that is fifteen thousand.
The times-fifteen shortcut
If the 1000 is the awkward part, turn the sum around and use the trick for multiplying by 15: take ten of the number, then add half of that again.
- 1000 x 10 = 10000
- Half of 10000 = 5000
- 10000 + 5000 = 15000
The same route handles 15 x 20 (200 plus 100 is 300) or 15 x 60 (600 plus 300 is 900) without writing anything down.
What 15000 is
- 15000 seconds is exactly 4 hours and 10 minutes.
- In primes it is 2 x 2 x 2 x 3 x 5 x 5 x 5 x 5, so it is nowhere near prime itself. Its digits add to 6, which is why it divides by 3 to give 5000.
- One other page here lands on the same answer from different operands: 150 x 100 = 15000.
Not the same as
- 15% of 1000 is 150, a hundredth of this answer. Plenty of people arrive wanting the percentage.
- 100 x 15 is 1500, one zero short.
- 1.5 x 1000 is also 1500, for the same reason.
Double this and you get 30 x 1000 = 30000. Every other pair is indexed on multiplication answers.