Ubuntu Precise numeric pad in laptop behaviour change

Hi
I am facing strange issue with numeric pad in my laptop.
When I am trying to type numbers in numeric pad it is either showing strage
number patters or turns to some functions
e.g If I type 357 it turns to 7=4
Plus sign takes screen shot left arrow key shows undo etc in editor .
Some kids played in my keypad and not sure if it was happened due to that.
Any hint to resolve the same.

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JAGANADH G
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*ILUGCBE*
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