Each volume includes a collection of mathematical tasks focused on the big mathematical ideas in the grade level that create opportunities for students to engage in visual mathematics, play, and investigation. For each big idea, the text will introduce and explore the big ideas and address the questions: What is the big idea and why is it important? Activities in the three areas - visual math, play, and investigation - will be provided for exploring each big idea along with space for students to write and draw what they are thinking about each concept.