10 mm = 1 cm
390 mm = 39 cm
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15.35 in.
390 mm = 15.4 inches, approx.
25,4 mm = 1 in (exactly) → 390 mm = 390 ÷ 25.4 in = 15 45/127 in ≈ 15.35 in
there are 10 millimetres in each centimetre. so 10x39 gives 390mm in 39 cm.
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