Looking for STEM challenge cards for kids that are engaging, hands-on, and require no prep? These 3 Sample Printable STEM Challenge Cards include 30 engineering challenges designed for ages 8–10 (grades 3–5). Students use household and classroom materials to solve real-world problems while practicing critical thinking, creativity, and perseverance. Perfect for: Elementary STEM activities STEM centers Engineering challenges for kids Homeschool STEM curriculum Early finisher activities Sub plans A