638 US customary cups in US customary teaspoons

Conversion formula
How to convert 638 US customary cups to US customary teaspoons?

We know (by definition) that: $1\mathrm{uscup}\approx 48\mathrm{usteaspoon}$

We can set up a proportion to solve for the number of US customary teaspoons.

Now, we cross multiply to solve for our unknown $x$:

Conclusion: 638 ⁢ uscup ≈ 30624 ⁢ usteaspoon

Conversion in the opposite direction

The inverse of the conversion factor is that 1 US customary teaspoon is equal to 3.26541274817137e-05 times 638 US customary cups.

It can also be expressed as: 638 US customary cups is equal to $\frac{1}{\mathrm{3.26541274817137e-05}}$ US customary teaspoons.

Approximation

An approximate numerical result would be: six hundred and thirty-eight US customary cups is about thirty thousand, six hundred and twenty-four US customary teaspoons, or alternatively, a US customary teaspoon is about zero times six hundred and thirty-eight US customary cups.