It would have been 149,997,988 years BC (in 2013). But, assuming that 150 million is, at best, accurate to the nearest million years, for all intents and prposes, the answer should be 150 million years BC.
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One million is one thousand thousands. Three million is then three thousand thousands.
To calculate how many years ago 1642 was from the current year, you would subtract 1642 from the current year. For example, if the current year is 2022, the calculation would be 2022 - 1642 = 380 years ago. Therefore, 1642 was 380 years ago from the current year.
Year 17990 BC.
.3 is the same as three tenths. Three tenths of one million is three hundred thousand years.
393 years ago this 2009 year x x