You would do that by looking at the hundredths place.
1 is whole next 1 is tenths 2 is hundredths.
Is it 0 1 2 3 4 or 5 6 7 8 9?
If it is 0 1 2 3 4 you would turn it into a 0.
If it was 5 6 7 8 9 it would make the tenths go up +1 and the hundredths and thousandths places 0.
So it would be 1.100