Most numerological systems are Base-10, using Arabic numerals without the zero.

Formulas and Definitions

Elements of Numerology (*.pdf)
Numerology Basics (*.pdf)

Arithmetic

Instant Numerologist (*.pdf manual) ~ [supplemental software]
Meanings of Numbers (*.pdf)
Numerology: book 1 | book 2 (*.pdf books)
Ultimate Guide to Numerology (*.pdf book)

Patterns

Profitable Patterns for Stock Trading (*.pdf book)

Repeaters

Repeating Numbers (*.pdf)

Calendric

Note that so-called "Chinese Astrology" is actually a form of Calendric Numerology.

Ba Zi (*.pdf)
Chinese Astrology (*.pdf book)
Imperial Astrologer Tutorial (*.pdf)