I assume you're trying to write 25.4mm/inch in scientific notation.
To write something in scientific notation, move the decimal place forward or backward until only one number is not a decimal. Then, multiply it by 10x, where x is the number of times you moved the decimal place back. If you moved the decimal place forward, then x would be a negative number.
In this case, 25.4mm = 2.54 x 101mm (the decimal place was moved forward once)
Thus, 25.4mm/inch is written as (2.54 x 101mm)/inch in scientific notation
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