Converting to mm, cm, m, kmConverting mm to cm Convert 4 mm in cm 4 mm = 4 × 1 mm = 4 × 1/10 cm = 4/10 cm = 04/10 cm = 0.4 cm ∴ 4mm = 0.4 cm Convert 4 mm in cm 4 mm = 4 × 1 mm = 4 × 1/10 cm = 4/10 cm = 04/10 cm = 0.4 cm ∴ 4mm = 0.4 cm Convert 4 mm in cm 4 mm = 4 ×