500,000,000 lbs.
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500,000
To write 0.5 billion, you would start with the number 0.5, which represents half of a whole. Then, you would multiply this by a billion, which is 1 followed by nine zeros. Therefore, 0.5 billion is written as 500,000,000.
1,500,000
Oh honey, it's not rocket science. Half a billion is written as 500,000,000. That's five hundred million for those who like to be fancy. Now go out there and show off your newfound knowledge, you math wizard!
1.5cm