Get Smart! Maths Concepts, published by Penguin in 2008 is now available as an e-book.
Check it out!
http://www.amazon.com/kindle/dp/B008ESLWRK/ref=rdr_kindle_ext_eos_detail
Or
http://www.flipkart.com/get-smart-maths-concepts/p/itmdumyhbgh6dyqh?pid=DGBDGGY4M2SVYDMH