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To convert from millimetres to centimetres, divide by 10. For example, 80 millimetres is equal to 80/10 = 8 centimetres. 72 millimetres is equal to 72/10 = 7.2 centimetres.
0.8 metres is 80 centimetres, which is 800 millimetres.
There are 10 millimetres in one centimetre. Therefore, 8 centimetres is equal to 8 x 10 = 80 millimetres. Subtracting 5 millimetres from this gives 80 - 5 = 75 millimetres. 8 centimetres is therefore 75 millimetres, or 7.5 centimetres, longer than 5 millimetres.
The answer depends on 80 what: 80 millimetres, 80 centimetres, 80 inches, metres, miles?
There are 10 millimetres in one centimetre. Therefore, 8 centimetres is equal to 8 x 10 = 80 millimetres. Therefore, 8 centimetres is equal to 80/5 = 16 times longer than 5 millimetres.