How many zero's in 40 billion?

Answer 1

* In those countries that use the long scale based on powers of a million, like Europe:

40 billion = 40 × (10^6)^2 = 40 × 10^12 = 4 × 10^13 → there are 13 zeros in 40 billion.

* In those countries that use the short scale based on powers of a thousand plus one, like USA:

40 billion = 40 × (10^3)^(2+1) = 40 × (10^3)^3 = 40 × 10^9 = 4 × 10^10 → there are 10 zeros in 40 billion.

Answer 2

10.