Reading to Learn has been adopted as one of the Key Tasks since the curriculum reform in 2001 in Hong Kong. Recently, schools are encouraged to extend Reading to Learn to Reading across the Curriculum (RAC) and Language across the Curriculum (LAC) to broaden students’ knowledge base and connect their learning experiences in different subjects to meet the objectives of the new curriculum. The project team has designed a series of picture books in mathematics for primary mathematics teaching and learning. These picture books present situations related to different mathematics topics, which aims to be illustrated by teachers to teach mathematical concepts and skills.