With both my girls (now 4 and 6) I purchased a number chart poster is was about 48"x48" both of them liked to visualized numbers count them out first by one's then by 10's, 5's then later by 2's after that they didn't need the chart for the other numbers. Also on the back it has a couple of activities, they loved to do the prime numbers one the best, there is also a small chart 5x11 on the back I copied that so they could do the prime #'s over and over as many times as they wanted.