How to convert 423 US customary teaspoons to metric teaspoons?
We know (by definition) that:
We can set up a proportion to solve for the number of metric teaspoons.
Now, we cross multiply to solve for our unknown :
Conversion in the opposite direction
The inverse of the conversion factor is that 1 metric teaspoon is equal to 0.00239815763842858 times 423 US customary teaspoons.
It can also be expressed as: 423 US customary teaspoons is equal to metric teaspoons.
An approximate numerical result would be: four hundred and twenty-three US customary teaspoons is about four hundred and sixteen point nine nine metric teaspoons, or alternatively, a metric teaspoon is about zero times four hundred and twenty-three US customary teaspoons.
 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.