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Since 1 cm = 10 mm 8cm = 80mm So, 80mm/5mm = 20 Therefore, 8cm is 20 times longer than 5 mm.
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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.
In order to solve this you first need to convert the cm value into mm. This is to give a number that's easy to work with, and has consistent units with the rest of the question. There are 10mm in a cm. Thus to convert from cm to mm, you need to multiply by 10. In this case we have 8cm. This converts to mm as 8x10 = 80mm. So the question is 80mm + 6mm. This works out at 86mm.
81mm is more ie 81mm=8.1cm