I use these easy little practice charts in my math groups. There are four different charts to choose from: 1-30 in order and mixed, and 1-20 subitize dominos dots and mixed. My kids have improved greatly with their recognition of numbers fro 1-30. As they improve we practice with the mixed numbers. To really get them thinking we use the subitize chart of either in order numbers or mixed. We all get our fingers on the first number and read the cards together. It only takes a few seconds at the beginning of math groups and really helps improve number recognition. SUPER EASY.....SUPER QUICK!!