Number fun

This book is like 210 individual puzzles while at the same time it is one very large puzzle. Things needed to play this game. 1. A handheld calculator. 2. A pencil with a good eraser. 3. A good amount of patience. 4. At least some interest in puzzles. Age requirement Good for any age if you can add and subtract and use a calculator. To try this without a calculator would require reams of scrap paper and lots of time.