Answer:
to express in decimal form , we have to join convert the mixed fraction into a improper fraction. 
8 7/90 = d * w + n
 = 90 * 8 + 7
 = 720 + 7
 = 727 / 90
 now you have to make the denominator into a mutiple of 10 
 = 727 / 90 divided by 9 
 = 80 / 10 
 = 0.80
Explanation:
hope it helps .