How to convert 400 UK tablespoons to US customary teaspoons?
We know (by definition) that:
We can set up a proportion to solve for the number of US customary teaspoons.
Now, we cross multiply to solve for our unknown :
Conversion in the opposite direction
The inverse of the conversion factor is that 1 US customary teaspoon is equal to 0.000821486932291667 times 400 UK tablespoons.
It can also be expressed as: 400 UK tablespoons is equal to US customary teaspoons.
An approximate numerical result would be: four hundred UK tablespoons is about one thousand, two hundred and seventeen point two nine US customary teaspoons, or alternatively, a US customary teaspoon is about zero times four hundred UK 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.