Fun and colorful set of Subtraction Flash Cards will help get your child started on the right track with essential math skills! Flash card set will help your child learn to subtract numbers 0 through 9, and master subtraction within 20. Flash cards are double-sided, with a problem on the front and the answer on the bottom of the back. Pack includes 60 cards with 120 problems in all. Makes a great one-on-one parent/child activity. Kids can use them independently, too. Ideal for reviewing, practicing, and developing accuracy and confidence. Perfect for on-the-go learning! For Grades K-2. Heavyweight coated card stock. Cards have rounded corners for reduced wear and easy handling. Flash cards measure 3.13'' wide x 4.63'' high. Flash card box measures 3.17'' wide x 4.67'' high x .67'' deep.