• what is the need of number line 

Although this image only shows the integers from −9 to 9, the line includes all real numbers, continuing forever in each direction, and also numbers not marked that are between the integers. It is often used as an aid in teaching simple addition and subtraction, especially involving negativenumbers.

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we need number line because you know clash of clans
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to know about negetive and positive no.
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yes it is
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