I used this for a variety of things. I used it in my math centers/partner games where the students pulled a 2 digit number. After that they place the amount of tens and ones in that number by laying down place value blocks in the appropriate box and than writing the expanded form. I also used this whole group by placing this in a plastic cover sheet and giving the student dry erase markers. I called out/showed a 2 digit number and they drew the tens and ones blocks and wrote the numeral and expanded form!! They would erase when done and be ready to go for the next number!