AN innovative maths initiative, which draws on expertise from across the world, is helping hundreds of children in the North of England master their numbers. Experts from Shanghai have been working with staff and children from Archimedes NE Maths Hub in an annual teacher exchange designed to improve numeracy.Scores of teachers met at Carmel College, Darlington and in Durham to hear the latest developments in how maths can best be taught so that pupils learn more deeply and retain their knowledge for longer.