9,000,000,000.00
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9 billion in standard form is 9.0 × 109
9,000,000,000 = 9 billion
2 x 10^9
7.401 x 10^9
You can write 1 billion Australian dollars like this 1,000,000,000 AUD. You can also save 1 x 10^9 A$ or AU$.