After learning and using these unique methods of calculations, based on natural processes of the mind, you can perform many arithmetic operations without paper and pencil within seconds.The simplicity of the methods makes them so powerful that you can have solution of any mathematical problem with one or two lines of working. And the techniques are easy and fun to learn
ThriftBooks sells millions of used books at the lowest everyday prices. We personally assess every book's quality and offer rare, out-of-print treasures. We deliver the joy of reading in recyclable packaging with free standard shipping on US orders over $15. ThriftBooks.com. Read more. Spend less.