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if this means that the whole pitch he runs (if that is the diamond) has side lengths of 27mm, then he runs 27*4 mm which is 108mm, there is 1000mm per m, so 108/1000 = 0.108m run, this does not seem like it should be the size of a baseball diamond, so there might be a typo in that question

The metric system works on tens or multiples of.

Roughly.and these are approximations

1mm = .04 of an inch

25 mm (millimetres) = 1inch

300 mm or 30 cm (centimetres)=12 inches or 1 foot

36 inches or 3 feet or 1 yard = about 900 mm or 90 centimetres.

1000 mm or 100 cm or 1 metre = about 40 inches

1 kilometre 0r 1000 metres = 0.6 of a mile

1.6 kilometres = 1 mile (3760 yards or 5280 feet)

there are rough rule of thumb approximations.

so you see a baseball diamond of 27 millimetres is indeed a small diamond. about just over 1 inch a side.

however if it were 27 metres it is about the correct size.

Standard baseball diamond is 90 feet between bases. This converts to 27.4 meters (not mm). So four sides distance is 108 meters, since the problem said about 27

27 millimeters is a little over 1 inch. I doubt that is the size of a baseball diamond.

MILIMETERS ARE AN INCREDBLY SMALL FORM OF MEASUERMENT YOU HAVE STATED 27CM THERE