Brian Butterworth is on a crusade to understand the number deficit called dyscalculia — and to help those who have it. In the mid-1980s, Paul Moorcraft, then a war correspondent, journeyed with a film ...

Subitising sounds technical and it’s unlikely you came across it when you were at school. Early Years expert Helen Hickson explores what subitising is and how you can help your child practise at home.