This fun picture books helps young children get to grips with subtraction through bold pictures, activities and things to spot on the page. Leon and Luna are having a magical adventure counting animals all around the world. Through the story, children aged 4 plus will learn about maths concepts including: counting backwards, counting down in fives and removing 10.Number Planet are picture books that help children explore first maths concepts. Titles in the series cover the topics of Addition, Subtraction, Measurements and Shapes.