12,059
The standard form is 12,800
The correct way to write the year on an invitation is "two thousand twelve." This follows the standard format for writing out the year in words.
1.12x10^5
712000
6,112
The standard form is 812,012,005
The standard form is 1,000,203,112.12
9,012,098
800,012,005
12,036,000.06
5612000
85,016,012