Math GCCS values numeracy, in-depth mathematical thinking and problem-solving. Math Home > Curriculum > Math Illustrative Mathematics Illustrative Mathematics is a newly developed, problem-based curriculum designed to meet the diverse needs of all learners. Students learn mathematical concepts through real-world contexts and learn to explain their thought process. The Illustrative Mathematics Curriculum helps teachers facilitate student learning through high-leverage routines and tangible math tools, which can help students make connections between mathematical concepts and computation procedures. When possible and appropriate, mathematics is woven into classroom Expedition content. Students hone their mathematical skills by analyzing social or scientific data and building scale models of local structures and the natural world.