Addition and Subtraction Challenging Task Cards (Bar Modeling Suggested) Practicing difficult word problems with addition and subtraction is fun with these task cards! Use the task cards as a math center or whole class activity such as Scoot or Roam the Room. Included are 12 task cards (printable or Google Form) and an answer sheet with a QR code that students can scan to take them directly to the answer sheet for the non-digital version and an answer sheet for the Google Form with a QR code t