10 mm = 1 cm so 390 mm = 390/10 = 39 cm. Simple!
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10 mm = 1 cm 390 mm = 39 cm
390. There are 10 mm in 1 cm, so 39 x 10 = 390.
25,4 mm = 1 in (exactly) → 390 mm = 390 ÷ 25.4 in = 15 45/127 in ≈ 15.35 in
1 cm = 10 mm so 1.43 cm = 14.3 mm
2.4 cm = 24 mm 1 cm - 10 mm