Ask Einstein is the newest technology in flash card learning. Kids will see a flash card and try and get the correct answer by placing Einstein on the card. If they are correct - Einstein flashes green and makes sounds. If the answer is wrong Einstein flashed red and buzzes. This is a booster pack of 100 flash cards covering early addition and subtraction. Plus, we've included 5 different games kids can use to challenge their knowledge: -STACK THE DECK GAME is a game of strategy and competition -HOT PATOTO EINSTEN GAME is a game of speed and fast action -RUN THE DECK GAME is a challenge for every kid (and adult) -TEAM CHALLENGE GAME is a great team building and bonding game -THE EINSTEIN DUAL GAME is the ultimate fast action trivia game The cards are 3.5" wide x 4.25" tall. Great for kids ages 3 - 6, Einstein character sold separately, packaged in a fine color box so it is great for gift giving. Perfect for school, home, or home-schooling!