RNFG
     +---------
XWNR | LWWPXFXN
      -LXWXR
       =====
        XFFGF
       -LJNNF
        =====
          LJFXN
         -LGPJR
          =====
           LHPP

base: 10
letters: FGHJLNPRWX
difficulty: easy
restrictions: no multiplication