A

One billion typically has 9 zeros and is written as 1,000,000,000.

## Explanation:

When you need to solve a math problem with large numbers, it is important to know the differences between million, billion, and trillion.

One million, however, is one thousand times less than a billion, meaning that it only has 6 zeros (1,000,000). One trillion is 1.000 times larger than one billion and is written with 12 zeros: 1,000,000,000,000.

In the old UK billion, there was also 12 zeros, but this does not apply to the contemporary international numbering system.

When operating with different numbering systems, it is also important to remember their differences. Lakh and crore are both components of the Indian system of numbering. Some people confuse lakh and crore with million and billion, but the correct answer is that 1 lakh has 5 zeros and 1 crore has 7 zeros. Thus, 1 lakh equals 100,000, and 1 crore is 10,000,000. One million would equal 10 lakh whereas one billion is 100 crores. You can find out more about the Indian numbering system here.