How to convert 421 US tablespoons to imperial cups?
We know (by definition) that:
We can set up a proportion to solve for the number of imperial cups.
Now, we cross multiply to solve for our unknown :
Conversion in the opposite direction
The inverse of the conversion factor is that 1 imperial cup is equal to 0.0456418023944838 times 421 US tablespoons.
It can also be expressed as: 421 US tablespoons is equal to imperial cups.
An approximate numerical result would be: four hundred and twenty-one US tablespoons is about twenty-one point nine one imperial cups, or alternatively, a imperial cup is about zero point zero five times four hundred and twenty-one US tablespoons.
 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.