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.
Chat with our AI personalities
64 or 123
These digits can be represented based on their Place Value Notation.
They make the numbers invisible to the people at Answers.com, possibly.
When using front-end estimation, first you add the front-end digits. Then adjust by estimating the sum of the remaining digits. Then add the two values
The correct answer is "expanded form".