To convert from cm to inches, you divide by 2.54
800mm is 80cm, so to get the answer you need to do 80/2.54
=31.496063
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80
1cm = 10mm 800mm x (1cm/10mm) = 80cm
1mm = .001 meter 800mm = .8 meter
To find the percentage, you can use the formula: (20cm / 800mm) * 100. Simplifying this, you get (2.5 / 100) * 100 = 2.5%. Therefore, 20cm is 2.5% of 800mm.
.8