Counting

This book is part of a series which looks at why and how we measure, encouraging children to discover for themselves how standard measuring systems have developed. Children can make their own measuring tools, based on authentic ancient and modern instruments. There are lots of experiments to try and problems to think about and, at the back of each book, a list of important events shows the history of measuring at a glance. This book looks at the importance of numbers and the history of counting from the abacus to computerized bar code, including the first numerals, ancient and modern calculators, magic squares and combination locks.