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The decimal number system is positional in nature. To know what a given digit means, you have to know where it is with respect to the decimal point. The number zero can be used to indicate that a given position is vacant. This is necessary in order to know what the other digits are positioned. For example, the number 10. That means ten. If we wrote it as 1 . the number would still be in that position, but it would be hard to see the position. Putting in a zero makes it clear.

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Q: Why zero is place value holder?
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