These activities involve counting, recognizing numbers and Base 10 blocks 11 to 20. MAB fun!They make great, independent tasks for Math centres. The squares are approx 8.7 cm square with an image of blocks at the top, and a choice of 3 numbers underneath. I usually cut and laminate the squares. I use these as a Math Centre Activity. The task could be to clip a peg on the correct numeral; but you could also mark with counters, buttons etc. I sometimes use as a whole sheet activity, and ask child