249,400,000 or Two hundred and forty-nine million, four hundred thousand.
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You write 18.1 million in standard form as 1.81 × 107
3.16 million in standard form is 3,160,000
12.34 million in standard form is 12,340,000
4.4 million standard form is 4.4 × 106
12.5 million in standard form is: 1.25 × 107