90 x 100 = 9000
90 x 100 = 9000. Multiplying by a hundred adds two zeros, so 90 turns into 9,000. The same shift is the one that converts a decimal into a percentage.
90 × 100 = 9,000
Adding 90 to itself 100 times gives the same answer.
Why the answer is 9,000
Multiplying by 100 adds two zeros. 90 has one of its own, so the product ends in three: 9,000. You can also read it as 9 x 10 x 100, or 9 x 1,000, which is why the answer looks like a round nine thousand rather than anything awkward.
The same move you use for percentages
Multiplying by 100 is how a decimal becomes a percentage: 0.9 x 100 = 90, so 0.9 is 90 percent. This page is that step taken one size further up, from 90 to 9,000.
What 9,000 is a quantity of
Ninety minutes is the standard length of a feature film or a football match, so 100 of them is 9,000 minutes. That works out to 150 hours, or 6 days and 6 hours of continuous running time.
Nearby pairs
- 9 x 100 = 900, ten times smaller
- 45 x 100 = 4,500, exactly half of this page
- 80 x 100 = 8,000
The full list sits on multiplication answers.