10000 x 1000 = 10000000
10000 times 1000 is 10000000, or ten million. Count the zeros: four in 10000 and three in 1000 make seven, so the answer is a 1 followed by seven zeros.
10,000 × 1,000 = 10,000,000
Adding 10,000 to itself 1,000 times gives the same answer.
Adding exponents instead of digits
10000 is ten to the fourth power and 1000 is ten to the third. Multiplying powers of the same base means adding the exponents, so 4 + 3 = 7 and the answer is ten to the seventh: 10000000. With separators it reads 10,000,000.
Ten million or a hundred million?
This is where the calculation usually goes wrong. Seven zeros is ten million. Eight zeros is a hundred million, which is what 10000 x 10000 gives. Group the zeros in threes from the right and read the group names off rather than trusting the look of the number.
Other names and sizes
In the Indian numbering system 10000000 is one crore, written 1,00,00,000. Counted in seconds, ten million is about 115.7 days, a little under four months. 100000 x 100 reaches the identical total from a different pair.
Related
- 10000 x 100 = 1000000, one million
- 86400 x 1000 = 86400000, the seconds in a day multiplied out