Focusing on counting and beginning to add and subtract, this book helps children to count on and back and develop an understanding of place value. It shows the value of number patterns in calculations, and it develops calculating skills, especially which operations make numbers more or less. The book is part of a series for teachers to help them to meet curriculum requirements to make children aware of the wide range of strategies available for mental calculation and improve the children's flexibility and quick recall of number facts. Each book provides information on the importance of mental maths and managing mental maths lessons, the range of strategies the children might choose from for counting and ordering numbers and for each of the operations, advice about appropriately sized numbers to use, and a selection of easily-adapted model activities for practice and discussion. Each book ends with a small number of photocopiable pages to support specific activities and a writing frame to facilitate self-evaluation.