4/1mm - only decimals can be translated as non-top heavy fractions, if you were asking what 0.4cm is as a fraction it is 4/10 cm or 2/5 cm.
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You neglected to say whether the 4mm is the radius of the circle, or the diameter,or the circumference. Each possibility leads to a different area.
151200
Pie (3.14159...) times (*) 2 times (*) radius === or This equation may be for the area but hopefully it's for circumference. Anyway, the answer to your question is 25.13274123... (Pie times 2 times 4mm).
The numerator of the fraction is 1.The numerator of the fraction is 1.The numerator of the fraction is 1.The numerator of the fraction is 1.
9.67 in fraction form is 967/100 in fraction form