In terms of crores 1 billon is equivalent to 100 crores ,. ie. 1bn(1b) = 1,000,000,000

**Conversion of Crores and Billions**

To understand how many crores make 1 billion, let's first clarify the terms "crore" and "billion" and then discuss their conversion.

1. **Crore:** In the Indian numbering system, a crore is equal to ten million or 10,000,000. It is often used to express large numbers in the Indian subcontinent and some other countries.

2. **Billion:** In the international numbering system, a billion is equal to one thousand million or 1,000,000,000. It is commonly used in countries like the United States and most of Europe.

**Conversion:**

To convert crores to billions, we need to divide the number of crores by 100. This is because 1 billion is equivalent to 100 crore.

For example:
- To convert 1 crore to billions: 1 crore ÷ 100 = 0.01 billion
- To convert 10 crores to billions: 10 crores ÷ 100 = 0.1 billion
- To convert 100 crores to billions: 100 crores ÷ 100 = 1 billion

Therefore, 1 billion is equal to 100 crores. Hence, the correct answer is option 'C' - 100.

**Summary:**
- 1 crore is equal to 0.01 billion.
- 10 crores is equal to 0.1 billion.
- 100 crores is equal to 1 billion.

Remember, this conversion is specific to the Indian numbering system and may not apply to other numbering systems used in different regions of the world.