To write four and a half million in numbers, you would write 4,500,000. This is because the "and a half" part represents 500,000, which is half of a million. Therefore, when combined with the four million, it becomes 4,500,000.
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Well, honey, you write four and a half million as 4,500,000. Just slap those zeros on the end and call it a day. Easy as pie!
500,000
1,500,000
4,500,000 is 4 and a half milliion.
4,500,000,000
Half a million is 500,000