642 US tablespoons in metric teaspoons
Result
The conversion result is: 642 US tablespoons is equivalent to 1898.6205979125 metric teaspoons.[1]
Conversion formula
How to convert 642 US tablespoons to metric teaspoons?
We know (by definition) that: 1 ustablespoon ≈ 2.95735295625 brteaspoon.
We can set up a proportion to solve for the number of metric teaspoons.
1 ustablespoon / 642 ustablespoon ≈ 2.95735295625 brteaspoon / x brteaspoon
Now, we cross multiply to solve for our unknown x:
x brteaspoon ≈ (642 ustablespoon / 1 ustablespoon) * 2.95735295625 brteaspoon → x brteaspoon ≈ 1898.6205979125 brteaspoon
Conclusion:
642 ustablespoon ≈ 1898.6205979125 brteaspoon

Conversion in the opposite direction
The inverse of the conversion factor is that 1 metric teaspoon is equal to 0.000526698172925903 times 642 US tablespoons.
It can also be expressed as: 642 US tablespoons is equal to 1 / 0.000526698172925903 metric teaspoons.
Approximation
An approximate numerical result would be: six hundred and forty-two US tablespoons is about one thousand, eight hundred and ninety-eight point six one metric teaspoons, or alternatively, a metric teaspoon is about zero times six hundred and forty-two US tablespoons.
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.