77mm is greater.
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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.
10 mm = 1cm .7 mm = 0.07 cm They are the same
3 decameters.
1 cm = 10 mm So 7/10th of a cm is 7 mm
10 mm = 1 cm 20 mm = 2 cm 30 mm = 3 cm . . 70 mm = 7 cm