10 is a multiple of 5, 10=5*2 So let's rewrite them to have a common denominator. [tex] \frac{4}{5} = \frac{4(2)}{5(2)} = \frac{8}{10} [/tex]
As you can see [tex] \frac{8}{10} \neq \frac{9}{10} [/tex] They are not equivalent. Because it is smaller! [tex] \frac{8}{10} \ \textless \ \frac{9}{10} [/tex]