990
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To write ninety nine in standard form, you would simply write the digits 9 and 9 next to each other, which is 99. In standard form, numbers are expressed using digits without any words or symbols.
I suppose you mean 1099. If you write it out, you get a 1, followed by 99 zeroes.
0.99
The number 99 would be spelled ninety-nine.
99 + 3 = 102