One pair of hands is never enough; the painters and sculptors of Hindu deities found this to be a problem and overcame by simpling adding extras. Apparently there is little evidence that the idea of multiple hands, and even heads, came from scripture. It seems to be more a practical issue relating to the depiction of deities; both a desire to demonstrate power and also a desire to show the nature of the deity by the objects they hold and the signs (mudra) they make.
Ganesha
Goddess Kali
All of these images are of the deities that adorn the Sri Veerama Kaliamman Temple in Singapore, a temple dedicated to the fierce goddess Kali.
Copyright Debbie Smyth, 6 August 2015
Travel with Intent 
Oh your hands are wonderful Debbie. Thanks for playing 😀
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In general, more hands were used to show the many characteristics/powers of a deity. You could find more answers here http://www.quora.com/Why-most-of-hindu-gods-are-visualised-as-bearers-of-many-weapons-and-arms
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