Are you looking for a way to review all whole number computation covered in 4th Grade? These 16 self checking QR Code Task Cards are perfect! They review addition through the hundred thousands, subtraction through the hundred thousands, 2 digit by 2 digit multiplication, and 3 digit by 1 digit division. I printed these on colored cardstock, laminated, and have used several times! My students love how they are able to receive immediate feedback as to whether they are correct or not. I hope you enjoy! :)