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There are 12 inches in each foot; therefore 5.6 X 12 = 67 inches, to the justified number of digits.
There are 2.54 cm per inch and 12 inches per foot. Therefore, there are 30.48 cm/foot, and 250 cm = 250/30.48 = 8.20 feet, to the justified number of significant digits.
A quadrillion has 16 digits.
There is no such thing as scientific digits. There are 6 digits in the number of which 3 are SIGNIFICANT (not scientific) digits.