Check Fraction only in Math Input

Questions
1

How can I just check for fraction form only in a math input? (No decimal)
Here’s what I have so far for the fraction of 1/6:

answer=input1
correct=numericValue("\abs(${answer.latex}-(1/6))")<=0.001
2

In general, some form of countNumberUsage should work… I believe you would add this to the correct statement:

and countNumberUsage(answer,1)=1 and countNumberUsage(answer,6)=1

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