oA million is a thousand thousand (1,000,000); a billion is a thousand million (1,000,000,000). Numerically, a million is a "1" followed by six zeros; a billion is a "1" followed by nine zeros. A common misconception is that a billion is a million millions. A million millions (a "1" followed by 12 zeros) is known as a trillion. Considering the numbers in relation to the power of 10: a billion is 10 to the ninth power; a million is 10 to the sixth power. Time
oBecause billions and millions are very large numbers, considering them in terms of very small units is a helpful way to compare billions with millions. For example, there are a million seconds in 12 days; there are a billion seconds in 31 years. People
oPopulation can be one way to understand and conceptualize the difference between a million and a billion. China and India have populations of over a billion people, while only 300 million people live in the United States. Several U.S. cities have more than a million residents: New York City has a population of more than 8 million; Los Angeles has a population of around 4 million. Chicago and Houston have populations of more than 2 million each, while there are more than 1 million people in each of the following cities: Philadelphia, Phoenix and San Diego.