It is: 15 mm = 1.5 cm
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10mm is 1cm so 15mm is 1.5cm
1.5cm equals 15mm. Therefore, it is greater than 8mm
15 x 35 mm = 525 mm, which is also equal to 52.5 cm.
How long is 20 cm
15 cm long and 5 cm wide is pretty nearly 15 cm long.