The chart employs a design technique I call visual redundancy. That's the use of visual elements, such as colors, to help the student associate things that are related to each other. The idea is to help the student look at information in a way that makes it easy to absorb.
Rather than the usual one-to-ten order used in most counting charts, this one starts with zero. This makes the numbers line up, and shows the child that each new decade of numbers is just another version of counting to nine. These little reminders make it easy to tackle a big number like 100.
UMA Method Instructions --
Understand: Point to the numbers on the chart as you count along with students. Point out the patterns in the numbers and the colors, to demonstrate the repetition.
Memorize: Keep the chart in a place where students can easily access and view it by themselves. Count along with students regularly. Encourage students to find high numbers like "30" or "20" and remember their names.
Apply: Challenge students to count as high as they can without skipping, and write down their numbers. Encourage them to beat their best score.