5.5 feet = 66 inches = 1,676.4 mm
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304.8 mm
There are 10 mm in 1 cm and 30 cm in 1 foot. Take 10mm and multiply by 30 cm to get your answer of 300 mm in 1 foot.
305 mm is 1 foot
A foot is 304.8 mm, so you have to divide by that number.
1 cm = 10 mm 55 divided by 10 = 5.5 cm