This file was created for my 3rd grade classroom to practice multiplying numbers by multiples of 10. This file contains 27 cards to use. To use, simply print on card stock and punch a whole where the "+"'s are. You will also need to circle the correct answer on the back. Students will figure out the correct answer and poke their pencil through the whole. I have used these types of cards in my classroom and the kids love it!