Memory Techniques for Numbers and Numbers

For numbers, I use a three digit system. For cards, I have a two card block system. The blocks is a trick that can reduce the number of images you need. So because a sub diamond seven clubs and a sub spades seven clubs have the same image, you don't need as many images. There's about about 2700 possible two card combinations with a two cardBlock system like I use. You only need about 1350.