It is required as a placeholder, to put other digits in its correct place. For example, in 102, the 1 is in the hundreds place. Without the zero, it would be in the tens place.
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Zero, since there is no underlined digit!Zero, since there is no underlined digit!Zero, since there is no underlined digit!Zero, since there is no underlined digit!
4 Every digit between the leftmost non-zero digit and EITHER the right most non-zero digit OR the rightmost digit after a decimal.
100 is a 3 digit number.
If the first digit can be zero, there are 5,040. If the first digit can't be zero, there are only 4,536.
To round a number to a particular digit, look at the digit immediately to the right of your target. If that digit is 4 or lower, zero it and everything to the right of it out. If that digit is 5 or higher, increase the target digit by one and zero everything to the right of it out. If your target digit is a 9, increasing it will turn it to zero and increase the digit to the left of it by one.