My littles love this activity when I get it out. We've been working on ten frames for months and this is just an extention. I have numbers between 20-99 on cards for them to choose and lots of egg cartons that I have cutinot ten frames. they choose a number, use manipulatives and fill the ten frames to create that number. I put this in a center and it gives me a chance to work with them on this skill. I use my center time for my tutor and I to work independently with them on skills they are having trouble with. This is one they all want to get to. I leave it out for the rest of year. How do you work with your class on this skill?