7.23x10^-4. Move the decimal place to the right. The number of times you move the decimal is the same number as the exponent.
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The value of the position of a digit in a number.
That's known as scientific notation. The scientific notation of 1439 is 1.439 x 103 The scientific notation of four million is 4 x 106
There are a number of places offering polar express games. Mostly web based for children. The Playstation 2 had a full featured polar express game back in its day.
The number on the front of the Hogwarts Express is 5972. This appears in the movies only and is the actual GWR number of the train used in the movies.
The noun 'number' is not a specific collective noun but it can be used as a collective noun where appropriate; for example:a number of questionsa number of ideasa number of animalsa number of people