one hundred undecillion
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9999 is the 4-digit number and 999 is the 3-digit number.
the leading digit
A digit is a number or numeral. A dividend is a number to be divided. A dividend is divided by a divisor to yield a quotient. A digit dividend is a single digit number that is being divided some other (non-specified) number. The word single is assumed to be there. It could be written like this: A (single) digit dividend is a single digit number that is being divided by another number. In mathematics, there are 1-digit dividends, 2-digit dividends, etc.
Oh, what a happy little question! With the digits 1-9 and 0, you have 10 options for each digit in a 4-digit number. So, you can form 10 x 10 x 10 x 10 = 10,000 different 4-digit numbers. Isn't that just delightful? Just imagine all the beautiful combinations you can create!
10, 24, 48, 80, 82