254 mm = 10 inches so 18 mm = 180/254 = 90/127 inches.
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7cm is much more than 18mm. Through conversions, 7cm is the same as 70mm, and 18mm is 1.8cm.
The equivalent of 0.15748031496 inches in fractions is about 157/1000 of an inch. When there are more than four numbers in a decimal it is better to round to the third or fourth number.
That's in the right order.
0.03 inches = 3/100 inches.0.03 inches = 3/100 inches.0.03 inches = 3/100 inches.0.03 inches = 3/100 inches.
56/100 or 14/25