Rewrite 9/10 and 23/25 so they have a common denominator

9/10    23/25
they have 50 in common, 10 times 5 = 50 so you time 9 by 5 which equals 45
9/10 = 45/50

25 times 2 equals 50 so you times 23 by 2 which you get 46
23/25= 46/50

The answer is the numbers between =5 and 5