QR codes are a blast! Add them to any lesson to rev up the students' excitement about learning. With these 32 task cards, your students will not only get a great review of subtracting 2 digit by 2 digit, but you'll see the excitement as the children use a mobile device to instantly check their answers. FYI: Please make sure you have a device (iPad, iPods, smartphone, etc.) that can scan QR codes before making a purchase. Task Cards are perfect for partner work, center/station work, SCOOT game,