This is a recording of a webinar delivered through the Global Numeracy Community of Practice. The Tayari Program is charged with developing a tested, cost-effective and scalable model of early childhood education (ECE). It is currently being piloted in ECD centers in Kenya, targeting 4-6 year-old children. Tayari includes classroom materials for teachers and students, teacher training and ongoing in-classroom support, and a health component. In this webinar, we will focus on the mathematics classroom materials, and illustrate the collaborative process of developing teacher guides and student activity books that are aligned to the Kenyan ECD Syllabus. We will share our process of creating materials beginning with identifying core skills and aligning these skills to the Kenyan ECD Syllabus, defining our scope and sequence, creating developmentally appropriate activities for maths, and designing the teacher’s guide for ease of use by teachers.