If you mean: 10/18 then it is 5/9 in its lowest terms
9/10
18/20
. 9/10
10 18
Fractions that are equivalent to 9/10 are 18/20, 18/30, 36/40....
18/20 can be reduced to 9/10
It is: 18/5 = 36/10
18/20
10/36
5/18
18/20 and 90/100
9/10 is equivalent to 18/20, 27/30. 36/40. etc.