Learning Wrap-ups now feature a new "Key" shape and stay together with a rivet at the top. The single string is already attached, making them easier to use and organize. They offer a fun and unique way to help students commit their math facts to memory. Students wrap the string from the problem on the left to the answer on the right, and then turn the Wrap-us over to see if they got it right. They utilize many learning senses and are fun enough that students are willing to use them over and over until they master their subtraction facts. This set covers 120 basic facts. You can use a stopwatch to measure improvement and to see how fast they can really go.