Encourage learning about measurement with these fun mystery magic color scratch activity cards. Great for learning games that aid math curriculum, these cards come in bright colors that features three hidden images and have a ruler on the bottom. Simply scratch away the black coating to see what’s underneath than write down how many inches long each hidden figure is in the space provided. You could even ask students to make a short presentation about their findings! Includes 12 cards and 12 plastic scratching tools.  24 pcs. per unit) 6 1/2.