DAX measure use Month Number as value to return true / false

Hi, I wanted to use the monht nuumber as a true / false criteria in a measure, my starting point was

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This gives a count of 1 to 12 in a pivot and works perfectly well with say [TotalSales] / [ALLMONTHS] ,

but if if try and use it with an IF ;

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I get an error, I sort of get why this does not work but is there another ( hopefully simpler) way to get a true / false from the month number,
ive attached workbook to give some context.

Richard.

Thanks, I thought it was something more complicated.

Richard.

Just one question, I used in as a Denominator in TotalDivide:=

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this works, so Allmonths here must be a number?

Richard.

Having now looked up MS Docs;

You do not generally need to use the VALUE function in a formula because the engine implicitly converts text to numbers as necessary.