78,900,000,000 in Scientific Notation = 7.89 x 1010
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5.79*107 km
Expanded notation of 900 = (9 x 100) + (0 x 10) + (0 x 1)
900 = (9 x 100) + (0 x 10) + (0 x 1)
987 in expanded notation as an addition expression would be 900 + 80 + 7. This is because each digit is represented by its place value, with the hundreds digit in the hundreds place, the tens digit in the tens place, and the ones digit in the ones place. Adding these together gives us 987.
If leading zeros are allowed (like 004 or 082), then there are 1000. Start with 000 and go to 999. If leading zeros are not used, then the lowest number is 100, so subtract off the first 100 numbers (000 through 099) so it's 900.