Lifehacker reader Will writes in with a memorization system he picked up while taking an art class that required him to remember long dates attached to paintings. Using a "Red Table" of mnemonic sound-to-numbers devices, he converts long numbers into words, which he can then re-convert by knowing which letter sounds correspond to certain numbers. He's posted a multi-page beginner's guide to this system, which includes links to other guides and even a software tool to help with the conversion. For another angle on memorizing numbers (or anything else), try the number/rhyme technique and the readers' suggestions that follow.