How many quarters in a hundred dollar bill?

Answer 1

You can cut the 100 dollar bill into 4 quarters.

(Whether this is legal or not is a different matter.)

a quarter = $0.25

→ $1 = 4 quarters

→ $100 = 100 × 4 quarters = 400 quarters

→ there are 400 quarters in $100.

Answer 2

There are 4 quarters in 1 dollar.
Therefore, 4 x 100 = 400 quarters.