I have a new 5 in my pre K class that is reading and decoding great. She knows her numbers one - ten and can manipulate items in order to answer addition and subtraction story questions. She however, can not understand double digit numbers past 10 and is easily frustrated by them. She is not behind, she can count a great distance orally, and can do other math tasks. This would just be the next logical step-to recognize the double digit numbers-but I am clearly not doing it the right way. I am wondering what you do in your classes to facilitate this beyond just memorizing them.