421 US customary teaspoons in US tablespoons
Result
The conversion result is: 421 US customary teaspoons is equivalent to 140.333333333333 US tablespoons.[1]
Conversion formula
How to convert 421 US customary teaspoons to US tablespoons?
We know (by definition) that: 1 usteaspoon ≈ 0.333333333333333 ustablespoon.
We can set up a proportion to solve for the number of US tablespoons.
1 usteaspoon / 421 usteaspoon ≈ 0.333333333333333 ustablespoon / x ustablespoon
Now, we cross multiply to solve for our unknown x:
x ustablespoon ≈ (421 usteaspoon / 1 usteaspoon) * 0.333333333333333 ustablespoon → x ustablespoon ≈ 140.33333333333317 ustablespoon
Conclusion:
421 usteaspoon ≈ 140.33333333333317 ustablespoon

Conversion in the opposite direction
The inverse of the conversion factor is that 1 US tablespoon is equal to 0.00712589073634204 times 421 US customary teaspoons.
It can also be expressed as: 421 US customary teaspoons is equal to 1 / 0.00712589073634204 US tablespoons.
Approximation
An approximate numerical result would be: four hundred and twenty-one US customary teaspoons is about one hundred and forty point three three US tablespoons, or alternatively, a US tablespoon is about zero point zero one times four hundred and twenty-one US customary teaspoons.
Footnotes
[1] 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.