How do you convert 1.15 into a mixed number?

To convert 1.15 into a mixed number, you first need to understand that the whole number part is 1, and the decimal part is 0.15. To convert the decimal part into a fraction, you can write 0.15 as 15/100. Simplifying this fraction gives you 3/20. Therefore, 1.15 as a mixed number is 1 3/20.