I need help with question i went to a 81 to a 57 and know that i think about it i should have kept the 81 but PLEASE help me

Answer:
The = sign
Step-by-step explanation:
[tex]\frac{7}{8} -\frac{9}{12} =\frac{1}{8}[/tex]
1/8 = 1/8
Answer: =
Step-by-step explanation:
[tex]\frac{7}{8}-\frac{9}{12} ?\frac{1}{8}[/tex]
We need to find a common denominator for the two
which will be 24
But we need to multiply the numerators as well to change them.
[tex]\frac{7}{8}(\frac{3}{3})-\frac{9}{12} (\frac{2}{2} )?\frac{1}{8}\\\frac{21}{24}-\frac{18}{24}? \frac{1}{8}\\\frac{3}{24} ?\frac{1}{8}\\Simplify\\\frac{1}{8} =\frac{1}{8}[/tex]