680 US customary cups in dry gallons
How to convert 680 US customary cups to dry gallons?
We know (by definition) that:
We can set up a proportion to solve for the number of dry gallons.
Now, we cross multiply to solve for our unknown :
Conversion in the opposite direction
The inverse of the conversion factor is that 1 dry gallon is equal to 0.0273799337916985 times 680 US customary cups.
It can also be expressed as: 680 US customary cups is equal to dry gallons.
An approximate numerical result would be: six hundred and eighty US customary cups is about thirty-six point five two dry gallons, or alternatively, a dry gallon is about zero point zero three times six hundred and eighty US customary cups.
 The precision is 15 significant digits (fourteen digits to the right of the decimal point).Results may contain small errors due to the use of floating point arithmetic.