Allows children to repeat simple sums again and again. This book introduces simple additions and subtractions which can lay solid foundations for numeracy. Children need lots of practice when learning important skills and this durable book allows them to repeat simple sums again and again. This book introduces very simple additions and subtractions which will lay solid foundations for numeracy. It comes with a special wipe-clean pen which is really satisfying to write with, yet easy to wipe off the shiny pages.