The Addition Working Charts (C 105-2) are the paper-based practice and recording charts that accompany the addition memorization sequence, used after children have built understanding through the Snake Game and Strip Board. They allow children to work systematically through all addition combinations in a written format, a key step in consolidating fact memorization in the 6–9 classroom. These charts wear out with use, so keeping a supply stocked means children can move through the sequence without interruption.