178mm is bigger, it equals 17.8cm
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800 Cm is bigger because cm is bigger than mm and 80 mm is already lower.
25 mm = 2.5 cm therefore 20 cm is bigger, obviously
Convert to the same units then you can compare the numbers. 1 cm = 10 cm → 64 cm = 64 × 10 mm = 640 mm 640 > 630 → 640 mm > 630 mm → 64 cm > 630 mm → 64 cm is greater than 630 mm.
1900 mm
Since 1 cm = 10 mm, they are the same.15 cm = 150 mm