Based on this concept, I've created a base-100 number system that encodes each digit into a single simple syllable which is designed so that they can be strung

Based on this concept, I've created a base-100 number system that encodes each digit into a single simple syllable which is designed so that they can be strung into unambiguous sequences. So if your mental phonological loop can hold 10 fast syllables, you can hold the equivalent of 20 decimal digits in this system. The system is logically arranged so it's pretty easy to memorize, and since it's base 100, the conversion to and from decimal is simple. The next step after is to memorize the addition and multiplication tables using them, which are of course much larger than in base 10. Once those become second nature, it should be possible to do mental arithmetic more quickly and with more mental registers to work with for larger numbers. I'm not nearly to that point yet, but it's a fun experiment. If people are interested, I can toss what I have up on github and write up a detailed explanation of the system. So far, I have a few little HTML5 drills for learning to convert, and an Anki deck for the addition tables.