First, you need to make both fractions have the same denominator. To do that, we will multiply the numerator and the denominator of 9/10 by 8, and we will multiply the numerator and denominator of 7/8 by 10.
After that is done, you will find that 9/10 = 72/80, and 7/8 = 70/80.
So, no you compare the fractions. 72/80 is bigger, since 72 is more than 70. Thus, 9/10 is bigger than 7/8.
I hope this is helpful! :D
