15 over 76,894 and x over 100. You cross multiply15 with 100 which gives you 1500 and divide by the number you have left, 76,894. You get 0.0195073738. Make sure you round!
It will be 1 of the 100block
5 of the tens block and 2 single
This fraction cannot be turned into a mixed number but it can be reduced to

or 0.75
hope this helps