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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.
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).
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.
The number of Smarties that can fit in a jar depends on the size of the Smarties and the size of the jar. To calculate this, you would need to determine the volume of one Smartie and the volume of the jar, then divide the volume of the jar by the volume of one Smartie. Keep in mind that packing efficiency and air gaps will also affect the final count.