The sum of 999,999,999 plus 999,999 is 1,000,999,998. This can be calculated by adding the digits in each place value starting from the right. The ones place adds up to 8, the tens place adds up to 9, the hundreds place adds up to 8, the thousands place adds up to 9, and so on. Finally, the result is 1,000,999,998.
3 + 999999 = 1000002
100000001000000000
I used a calculator on the computer and the answer is:1000999999998.
The result is 101,009,989,901
9.99999998 x 10^17
999998999000001
245122011972
3 + 999999 = 1000002
10003675491
100000001000000000
A Quadrillion, I believe.
1x10153 times 999999999 is 999999999x10153. Normalizing that, you get 9.999999999x10161.
The answer to this sum is 2010198.
It is 1000099998
10999998
42
-1 -2 -3 -4 -5 -6 -7 -8 -9 -99 -999 -9999 -99999 -999999 -9999999 -99999999 -999999999