Book excerpt: The A-Z of Primary Maths is a compendium of great ideas for teaching mathematics, organised around the 26 letters of the English alphabet. 'Maths foundations must be built in our primary schools. We need to create space for children to play with numbers, to explore patterns, to solve problems, and to laugh and chat in maths lessons. It's this start that will build a lifelong love of and confidence in maths' - Kate Frood.