How many fantasy novel books did C.S Lewis write?

C.S Lewis wrote seven fantasy novels, here is the list:

1.     The Lion the witch and the wardrobe
2.     The Prince Caspian, the return to Narnia
3.     The voyage of the dawn trader
4.     The silver chair
5.     The horse and his boy
6.      The magician's nephew
                              
                                 7.      The Last battle


Here is a list of the the books he wrote that later were made into films for cinema:
 
The chronicles of Narnia : The lion , the witch and the wardrobe  (2005)

The chronicles of Prince Caspian (2008)

The chronicles of Narnia : The voyage of the Dawn Treader (2010)

The lion, the witch & the wardrobe (1979)