Teaching Number : Advancing Children’s Skills And Strategies, Paperback by Wright, Robert J.; Stafford, Ann K.; Martland, Jim; Stanger, Garry, ISBN 1412921856, ISBN-13 9781412921855, Brand New, Free shipping in the US Th presents nine guiding principles for advancing children’s early number skills and offers clear strategies more advanced instruction in addition, subtraction, multiplication, and division .