680 mm is the same as 68 cm
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They are both the same because 680mm equals 68cm
It looks like you are asking about 7 times a length of 100 mm. One cm is 10 mm, so 100 mm is 10 cm. Multiplying this by 7 gives 70 cm, which is not greater than 680 cm. So the answer is no.
To convert centimeters to millimeters, you multiply by 10 since there are 10 millimeters in a centimeter. Therefore, 68 cm is equal to 680 mm.
5 cm = 50 mm which is greater
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