It is longer:
One mm goes into a cm 10 times.
50 mm is more than 4 mm.
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14 mm is bigger than 1 cm. This is because 1 cm is equal to 10 mm, so 14 mm is 4 mm larger than 1 cm.
400 mm = 40 cm
1 cm = 10 mm ⇒ 4 cm = 4 x 10 mm = 40 mm
3.5 cm is 5 times as long as 7 mm, and 4 times longer than 7 mm.
10 mm = 1 cm 4 mm = (4 / 10) = 0.4 cm = 2/5 of a cm