Learning Resources STEM Explorers: Mathlink Builders. Enhance critical thinking and problem-solving skills with 10 seriously fun building challenges! Construct animals, design real-world-inspired structures and more! Use the Mathlink cubes to learn lessons in symmetry, sequencing, and perspective. Includes 100 Mathlink Cubes in 10 different colours and an activity guide. Each cube measures 2cm D. Suitable for ages 5+.