I used a calculator on the computer and the answer is:1000999999998.
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1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
100000001000000000
9.99999998 x 10^17
999999999
9999999998000000001. Did the math on paper :P. {| |- | 999,999,998,000,000,000 |} Tha answer to 999999999 times 999999999 is 9.99999998 times 10 to the power of 17 which is 999999998000000000
The sum of 999,999,999,999 plus 1 is 1,000,000,000,000. This is because when adding 1 to a number, you simply increment the last digit by 1. In this case, the last digit changes from 9 to 0, and a 1 is carried over to the next place value.