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800 mm = 80 cm800 mm:= 800 mm * 1 cm/10 mm= 80 cm
1 cm = 10 mm 80 cm = 80x10 = 800mm And 800 mm is 800 mm You decide
1 cm = 10 mm 800 cm = 8,000 mm That's more than 1,000 mm. 1,000 mm = 100 cm
1 cm = 10 mm, which is less than 100 mm
There are 10 mm in a cm. So 4.9 cm is only 49 mm, far less than 490 mm.