for example like 5 billion is 5000000000
- How do you write 6 billion?
- How do you write out (in numbers) 63.3 billion?
- How to write 1 billion numerically in the US?
- How do you write $2,500 billion in numbers?
- Radioactive potassium-40 decays with a half-life of 1.25 billion years. You find a rock sample in which only 1/4 of the original radioactive?