I use this as a game for my students during math centers. They match the number, written form, Base-10 Blocks, and place value cards together. There will be four cards for each number. To allow students to check their work, I included different frog pictures on each of the group of cards. For example, the number 29 has four different cards (29, twenty nine, II ::::. Base-10 Blocks, and 2 tens 9 ones). Each of the four cards will have the same picture so the students can make sure they are matched up correctly.