How to convert 642 imperial quarts to US gallons?
We know (by definition) that:
We can set up a proportion to solve for the number of US gallons.
Now, we cross multiply to solve for our unknown :
Conversion in the opposite direction
The inverse of the conversion factor is that 1 US gallon is equal to 0.00518800115033638 times 642 imperial quarts.
It can also be expressed as: 642 imperial quarts is equal to US gallons.
An approximate numerical result would be: six hundred and forty-two imperial quarts is about one hundred and ninety-two point seven five US gallons, or alternatively, a US gallon is about zero point zero one times six hundred and forty-two imperial quarts.
 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.