1 over 10
90/100 = 9/10
Multiply the numerator (top) and the denominator (bottom) of the fraction by any non-zero number. You will have an equivalent fraction.
75/90 as a fraction in its lowest terms = 5/6
90/360 is one possible answer.
90/200 is one option.
100620/90 = 1118.
For any non-zero integer k, (90*k)/(100*k) is an equivalent fraction.
They can both be simplified to the same fraction, 1/3, so yes, they are equivalent.
There are infinitely many fractions equivalent to 10/45, but one would be 20/90.