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First convert 1.8 mm to inches. Since there are 25.4 mm in 1 inch, divide by 25.4:
1.8 / 2.54 = 0.070866 inches (although that's probably more significant figures than are warranted).
Now convert 0.07... to a fraction. Suppose you want to know it to the nearest 16th of an inch. You're trying to solve the equation
0.070866 = x / 16
where x is the numerator you want to know. To solve for x, multiply by 16 on both sides, and you get
x = 16 times 0.070866 = 1.1338...
So 1.8 mm is a bit more than 1/16 of an inch.
If you want to get it to the nearest 128th of an inch, multiply by 128:
128 time 0.070866 = 9.07...
So 1.8 mm is about 9/128ths of an inch. (The 1/16 we got before is the same as 8/128.)
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