I love how Lakeshore does things. I bought these multi-step problem solving kits for 3 different grade levels. Each box is organized by 2 step and 3 step problems. I wondered how I would insure I knew what was third grade and what was fourth. Sure enough, Lakeshore put 3 inconspicuous stripes on the third grade cards and four on the fourth grade cards. It saves me a step in labeling them. The fourth grade cards are perfect for challenging math for strong third graders. They love them and ask if they can do a couple each day.