Build your confidence in the primary classroom Deepen your own mathematical subject knowledge Discover why generations of primary teachers have relied on Derek Haylock's explanations of key mathematical concepts to support their understanding and strengthen their teaching This seventh edition has been fully updated to offer a broader exploration of mastery teaching, deeper connections to contemporary research and new coverage of how children learn to count. It is supported by a fantastic range of online resources including lesson plans, videos and test questions to extend your own learning.