First, rewrite 9/10 and 11/12 so that they have a common denominator

Step-by-step explanation:
Find common denominators:
[tex] \frac{9}{10} \times \frac{12}{12} = \frac{108}{120} [/tex]
[tex] \frac{11}{12} \times \frac{10}{10} = \frac{110}{120} [/tex]
Now compare:
[tex] \frac{108}{120} < \frac{110}{120}[/tex]
[tex]so \: \frac{9}{10} < \frac{11}{12} [/tex]