81mm is more ie 81mm=8.1cm
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Since 1 cm = 10 mm 8cm = 80mm So, 80mm/5mm = 20 Therefore, 8cm is 20 times longer than 5 mm.
7cm because if the mm was 5 or over then it would be closer to 8cm but it is lower than 5 so it is closer to 7cm.
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.
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