Traditional Chaldean numerology classifies number compatibility into two primary groups. The first group includes the numbers 1, 2, 4, and 7, while the second group consists of 3, 6, 8, and 9. The general principle is that numbers within the same group are compatible with one another but incompatible with numbers from the opposite group. For example, 1 is compatible with 2 but not with 9, while 6 is compatible with 9 but not with 4. The number 5 is considered superficially compatible with all numbers but should ideally avoid the influences of 3 and 8.
However, traditional exceptions to these rules exist. For instance, 8 and 9, though part of the same group, are often incompatible. Similarly, the number 15 is advised to avoid connections with 8, despite 15 reducing to 6, which belongs to the same group as 8. In certain scenarios, 8 may even align with 1. The relationship between 3 and 7 is generally destructive, yet under specific circumstances, it can be positive.
I am often struck by how far some numerologists stray from Chaldean traditions. The older generation of Chaldean numerologists, such as Cheiro, Gerun Moore, and Lloyd Strayhorn, has remained largely faithful to these traditional principles. However, many modern Chaldean numerologists, particularly those emerging after 2000, tend to develop their own systems of number compatibility and incompatibility.
These deviations can sometimes lead to significant confusion. In some instances, numerologists rely entirely on simplified astrological concepts of planetary friendships and enmities. Unfortunately, interpretations of these astrological relationships often vary widely. This approach doesn’t represent classical Chaldean numerology but, at best, a neo-Chaldean variant. I encourage readers to distinguish between traditional Chaldean methods, which are grounded in centuries of practice, and newer innovations that often depart drastically from the original teachings.
For casual numerology enthusiasts, deviations from traditional number-matching practices may not be a major concern, as long as no serious advice—like altering one’s name or surname—is being given. However, when working with a professional numerologist, adherence to proven methods becomes critical. Some teachers assert that if someone unknowingly causes harm through their practices, it does not generate karmic repercussions. Instead, they argue, the individual harmed is simply experiencing events dictated by their own energy patterns. But is such harm truly necessary?
The Mystery of Numbers, Luck, Worlds and Planets 