Includes 24 cards, recording sheets (two versions - blank space and circle true/false), and answer key. Each card includes a subtraction equality question (subtraction to 20) such as 20-5=14-7. The students have to decide if the equation is true or false and record their answer on the recording sheet. Then, they can check their work by scanning the QR code on the card. This set is perfect for kids who like Monster Jam/monster trucks.