These tricks, puzzles, memory tests, and other experiments will get you started. All you need is a pencil, a piece of paper, and a few supplies handy around the house. Guess your friend's secret number. Balancing Act shows how you draw half a painting, and the paper creates the other half. Cricket thermometer tells the correct time by counting the number of times a cricket chirps in 15 seconds. Or try the other dozens of fun challenges. Draw special straight lines that turn into circles. Get your Favorite Number to show up on a calculator every time. Try Zooming - taking a favorite cartoon and enlarging it with just pencil and paper. Grab this book and you'll be ready to have fun with numbers.