By using the suffix ING to represent 7, which is an arbitrary exception to fill a need, you can get a great deal of help in forming words for difficult numbers which end in 7, as 447 RoaRING, 117 DoTING, 577 LacKING, 397 MoPING.
Silent Letters Have No Figure Value
In addition to a, e, i, o, u, and w, h, and y, which have no figure value, all silent letters have none, because they are not SOUNDED. SOUND is the one and only indicator of digit value.
NIGHT is 21 for the GH is silent.
KNIFE is 28 for the K is silent.
MADGE is 36 for the D is silent.
Double Letters Are Sounded as One
Because they have but the one letter SOUND they have but the single digit value. This is merely another fact which is unalterable, because the basis of the Code is sound.
HUMMER has the sound of HUMER and is 34.
BITTER has the sound of BITER and is 914.
SPARROW has the sound of SPARO and is 094.
BILL has the sound of BIL and is 95.