First, the whole part,
15/9=1 and 6/9
So the form will be 1.<something>
Next the decimal part,
6/9=2/3=0.6666...
So the number is 1.66666... but we need to round to the nearest hundredth.
If we write the number up until hundredth we would get,
1.66[66666...] but the next decimal is 6 which is more than 5 so we add 1 to the hundredth and get 1.67.
Hope this helps :)