678 dry quarts in US customary teaspoons
Result
The conversion result is: 678 dry quarts is equivalent to 151478.936103896 US customary teaspoons.[1]
Conversion formula
How to convert 678 dry quarts to US customary teaspoons?
We know (by definition) that: 1 dryquart ≈ 223.42025974026 usteaspoon.
We can set up a proportion to solve for the number of US customary teaspoons.
1 dryquart / 678 dryquart ≈ 223.42025974026 usteaspoon / x usteaspoon
Now, we cross multiply to solve for our unknown x:
x usteaspoon ≈ (678 dryquart / 1 dryquart) * 223.42025974026 usteaspoon → x usteaspoon ≈ 151478.9361038963 usteaspoon
Conclusion:
678 dryquart ≈ 151478.9361038963 usteaspoon

Conversion in the opposite direction
The inverse of the conversion factor is that 1 US customary teaspoon is equal to 6.60157792047154e-06 times 678 dry quarts.
It can also be expressed as: 678 dry quarts is equal to 1 / 6.60157792047154e-06 US customary teaspoons.
Approximation
An approximate numerical result would be: six hundred and seventy-eight dry quarts is about one hundred and fifty-one thousand, four hundred and seventy-eight point nine four US customary teaspoons, or alternatively, a US customary teaspoon is about zero times six hundred and seventy-eight dry quarts.
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.