Student use number knowledge of before and after, ten more, ten less, and number fluency within 120 to create a mystery picture. As the students fill-in the missing numbers on the pussle pieces, they will color the cooresponding squares on the 120 Chart. When completed, if done correctly, the colored squares will create an image. There are 11 different images included in this set. These are great for a center activity because students enjoy them while working on CC standard 1.NBT.1. I hope your students will enjoy them too!