1billion-1 = 1less than a billion
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7,000,000,000 (7 billion) - 1 = 6,999,999,999
1.2 billion minus 3.2 million = 1.1968 billion
1000000000000 - 10000000000 = 990000000000
11.2 Billion
1.2 billion minus 312 million is 888,000,000