999 plus 999 = 1998
1998
999
999 + 9999999999 + 9999999999 + 8888888 = 20,008,889,885
999 + 12,345 is 13,344.
333 + 999 = 1332
999 + 36 = 1035
999 + 99 = 1098
999 + 98756434221 = 98765435220
999 999
536 + 245 = 781
999 trillion plus 99.9 billion is 999,099,900,000,000