2 and a quarter billion or 2,250,000,000 = 2.25x109.
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You write 38 billion (38,000,000,000) in standard form as 3.8 × 1010
9.1 billion in standard notation is 9,100,000,000
As a number 1/4 of a billion is 250,000,000
9 billion in standard form is 9.0 × 109
44.3 billion = 44,300,000,000