You write 1,600,000,000 as "one billion six hundred million." But seriously, who's counting? Just throw some commas in there and call it a day.
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1 000 000 000 600 000 000
3 000 000 000 plus 200 000 000 plus 600 000 plus 20 000 plus 9
4 600 000 000 = 4.6*109 in standard form.
600 000 000 000
0.5% of 600 000 is 3000 So the answer is 600 000.