One thing that that site doesn't take into account is that the double letters in Hebrew (The Finals), such as Kap (Kaph) - 20, Mim (Mem) - 40, Noon (Nun) - 50, Pe - 80, and Sadhe (Tzaddi) - 90, have two different numerical values depending on their location in the word you're checking. If they are the final letter in the word, their value is actually higher Kap - 500, Mem - 600, Nun - 700, Pe - 800, Tzaddi - 900. This only happens when they're at the end of the word. Check out this link for more info http://kabbalah-web.org/engkab/zohar/REDEMPTION.htm