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8,999,999,999,999,999,999,999,999,999,999,999,999,999,999,991 (8 quattuordecillion, 999 tredecillion, 999 duodecillion, 999 undecillion, 999 decillion, 999 nonillion, 999 octillion, 999 septillion, 999 sextillion, 999 quintillion, 999 quadrillion, 999 trillion, 999 billion, 999 million, 999 thousand and 991)
All of its multiples from 3 to 999
9 x 111 = 999 To simplify the sum, think of it as making 99. 9 x 11 = 99 Then multiply the answer (99) and 11 by ten. That is your answer
1998
You can calculate this as ((2 + 1000) x 999) / 2. That is, add the first and the last number, multiply the result by how many numbers you have - in this case "999" - and finally divide by 2.