To write 2.5 billion in numbers, multiply 2.5 by 1,000,000,000 because 1 billion equals 1,000,000,000 in numbers. In the Indian number system, it will be 2,50,00,00,000, whereas in the international system, it will be 2,50,00,00,000.

## How to write 2.5 billion in numbers and words?

The number 1 billion in numbers is 1,000,000,000. Therefore, if we want to find 2.5 billion in number form, we want to find 2.5 copies of 1,000,000,000 in number form. To do this, we simply multiply 2.5 by 1,000,000,000. This gives that to find 1.1 billion in numbers, we multiply 2.5 times 1,000,000,000. 2.5 × 1,000,000,000 = 2,500,000,000. In figures, 2.5 million is written as 2,500,000,000.