How many digitals are in a trillion?

Answer 1

The Tri- prefix implies three, thus:

• In those countries that use the long scale (based on power of a million) such as Europe

1 trillion = (1 million)3 = (106)3 = 1018

so 1 trillion has 19 digits (a '1' followed by eighteen '0's)

• In those countries that use the short scale (based on powers of a thousand) such as USA

1 trillion = (1 thousand)3+1 = (103)4 = 1012

so 1 trillion has 13 digits (a '1' followed by twelve '0's).

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

1 trillion = (10^6)^3 = 10^18 which is 1 followed by 18 zeros, ie 19 digits.

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

1 trillion = (10^3)^(3+1) = 10^12 which is 1 followed by 12 zeros, ie 13 digits.

Answer 2

13 in the short scale; 19 in the long scale (12 versus 18 zeros).

Answer 3

1,000,000,000,000