680, presumably.
680 X 1/8 = 680/8 = 85
680*1/10 = 68
There are 1000 metres in one kilometre. Therefore, 680 metres is equal to 680/1000 = 0.68 kilometres.
There are 30.48 centimetres in one foot. Therefore, 680 centimetres is equal to 680/30.48 = 22.31 feet.
There are 10 millimetres in one centimetre. Therefore, 680 centimetres is equal to 680 x 10 = 6800 millimetres.
One foot is equal to 0.3048 metres. Therefore, 680 feet is equal to 0.3048 x 680 = 207.264 metres.
Chlorophyll a is also called chlorophyll 680 due to its peak absorption of light at a wavelength of 680 nm. This specific absorption wavelength corresponds to the optimal energy level needed for chlorophyll a to carry out the process of photosynthesis efficiently.
680
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.
680
24% of 680= 24% * 680= 0.24 * 680= 163.2
12% of 680= 12% * 680= 0.12 * 680= 81.6