How do you write 1.99 as a mixed number?

To write 1.99 as a mixed number, you first need to separate the whole number part from the decimal part. The whole number part is 1, and the decimal part is 0.99. Next, you convert the decimal part to a fraction by placing it over 100 since there are two decimal places. Therefore, 1.99 as a mixed number is 1 99/100.