This is such a fun interactive lesson that the kids especially for Halloween! They get to have fun and have a treat while learning! Students first draw a card and solve the problem on that card. They then determine if the sum/difference is odd or even. They repeat this with a second card all while documenting their work on a worksheet. Once students complete the worksheet they get to build their spider using key. After they make their spider students complete a (CCSS) target worksheet to check up on student understanding. ALL MATERIALS ARE INCLUDED! This package includes the actual lesson plan with CCSS, all worksheets, the equation cards, the keys, a fun poster, and the target worksheet. I do this every year with my kiddos and I have done it with multiple grade levels (by changing the level of math problems and/or the key they use to decode).