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The value of a digit in a number is the face value of the digit multiplied by its place value. In the decimal system, the value of the digit immediately to the left of the decimal point is units so that its numeric value is the face value of that digit. The place value of any other digits is ten times the place value of the digit to its right - or one tenth of the digit to its left.

In the binary system, the place value goes up in multiples of 2, in the octal system in powers of 8 and in hexadecimal in 16s. There are also number systems based on other bases.

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It determines how much that digit is worth. See this article on place value. http://www.aaamath.com/plc.htm


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