xtreme

1. a great degree - the XTREME way to spell the word extreme.
2. really, really good or cool.
xtremely means to a great degree.

This thing is xtremely cool!

Tetradiv

a number that is divisible by four (a number that ends with 2 or 6 when tens digit is odd, or a number that ends with 0, 4, or 8, and tens digit is even).

48 is a tetradiv, because it is divisible by 4.

dek

/dĕk/ a duodecimal number that is one more than nine, and is written like this (↊) or this (χ).

This is the dek times table.