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A digit is a single whole number (0 to 9) in a number 10 or larger. For example, the number 432 has 3 digits. Each digit has a place value. In the number 432, the 2 is the number of ones in the number. The 3 is the number of 10's in the number, and the 4 is the number of 100's in the number.
A digit in base [math]n[/math] is one of the [math]n[/math] symbols used to represent the whole numbers zero through [math]n-1[/math]. Thus in base ten the digits [math]0,1,2,3,4,5,6,7,8,9[/math] are used to represent the numbers zero, one, two, three, four, five, six, seven, eight, nine.