one less than 5mm (half a centimetre)
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40 mm
25.4 mm = 1 in → 4 mm = 4 ÷ 25.4 in ≈ 0.16 in
1 cm = 10 mm ⇒ 4 cm = 4 x 10 mm = 40 mm
1 metre = 1000 millimetres so 4 m = 4*1000 mm = 4000 mm. Simple!
a point is 0.254 mm, or almost 4 points to the mm