X is pronounced EKS, has the KS sound and is 70.

Hard Ch as in ACHE has the K sound and is 7.

Gh and Ph as in Cough and Phone have the F sound and are 8.

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.