Usually means a thousand million. 1,000 x 1,000,000 = 1,000,000,000

Written as a 1 followed by 9 zeros.

Or using scientific notation as: 1 × 10

(In some countries such as the UK it sometimes means a million million 1,000,000 x 1,000,000 = 1,000,000,000,000 which is a 1 followed by 12 zeros, or 1 × 10

Imagine each of these little squares is worth a million dollars each, then you have a billion dollars:

Written as a 1 followed by 9 zeros.

Or using scientific notation as: 1 × 10

^{9}(In some countries such as the UK it sometimes means a million million 1,000,000 x 1,000,000 = 1,000,000,000,000 which is a 1 followed by 12 zeros, or 1 × 10

^{12})Imagine each of these little squares is worth a million dollars each, then you have a billion dollars: