Answer: 6.7 million cm
1 kilometer - 10 hectometers - 1000 meters - 100000 centimeters.
1 hectometer - 0.1 kilometer - 100 meters - 10000 centimeters
670 hectometers - 67 kilometers - 67000 meters -
6700000 centimeters.
So the answer is: 670 hectometers, are 6.7 million centimeters.
Prefix „hecto” means 100 times normal. For example: 1 hectogram - 100 grams.