This product contains enough cards to make four sets with two of each number and two commas. As a Title I math teacher, I work with first through fifth graders, and these cards can be used with all grades. I play "Place Value Decoder" with my students to reinforce the difference between expanded, word, and standard form. I write the expanded or word form on the board then have them "decode" it into standard form. My students love it, and they always ask to play it. ENJOY!!!!