I am not sure if this is an original technique or if someone else has already though of this, but recently I came up with an interesting way to develop a 3-digit system for numbers without creating 1000 different images, and also how to store up to 12 digits (or even more) in one single loci.
To create an easy 3 digit number system, all you have to do is break it down like this:
ABC = (A)(BC)
A is your first digit which will represent a color, then BC will be the existing image you have for that two digit number*
*I am obviously assuming you already have images for 00-99
You will need to have a color assigned for 0-9. Here is the list that works for me:
0 = white
1 = blue
2 = turquoise
3 = yellow
4 = orange
5 = red
6 = green
7 = pink
8 = brown
9 = black
Here are a few examples:
987 = 9(Black) 87(ForK) = Black Fork
399 = 3(Yellow) + 99(PiPe) = Yellow Pipe
428 = 4(Orange) + 28(kNiFe) = Orange Knife
Another tip on this part, don’t just visualize the color itself, but try to incorporate all 5 senses. What is the texture or taste associated with that particular color/object? What does it smell like? Does it make a sound? Is it bright or dull? Is it wet or dry? Cold or hot? Hard or soft? Anyway, you get the idea here. Really be as visual as possible.
Now obviously this will take some practice, but you’ll find that it is pretty easily adaptable after a short while.
So now how do you store 12+ digits in a single loci?
I store people I know in each Loci in all of my memory palaces. These people remain fixed in their individual spots and they act as “anchors” or “visual markers”. I use this technique to memorize a list of words; I’ll assign 3-5 words per person in each loci, and weave the words together in a story using that specific person.
Same thing with numbers. Once I have my 3 digit number turned into a color/word, I’ll store that word with my person in whatever loci they are in. Then I can simply add 3-4 more 3-digit numbers with that same person before moving to the next person in my next loci.
Here is an example with a set of four 3 digit numbers:
386 (Yellow FiSH), 971 (Black CaT), 732 (Pink MooN), 592 (Red PoNy)
Now lets say in your first loci (for me its my front door), you have assigned Conan O’Brien (This is just an example, obviously use anyone you like)
You would then store those numbers like this: Conan O’Brien is standing at my door and tries to open it, but when he looks down he sees a big bright Yellow Fish (386) in place of the door knob. This scares Conan, so he turns around to walk away but he is startled once again when a vicious looking Black Cat (971) crosses his path. Conan, being very superstitious, starts hallucinating and looks up into the sky to see that the sun has been overtaken by a big Pink Moon (732). Conan can’t take this anymore, so he whistles loudly and a big Red Pony comes crashing through the front door, which Conan then mounts and gallops away.
Congrats, you now have 12 digits in one loci.
Now, this is how I would personally do it, but make it something that works for YOU.
Again, this will take some practice, but I have found this method pretty effective!
I hope you guys found this helpful and I hope it works for you! Let me know if you have any questions!