Can you multiply 5132437201 by 452736502785 in seventy seconds without reaching for your calculator? Well you could if you used the techniques in this revolutionary book, now available in paperback at a time of growing concern about people's numeracy. The system, described as 'the shorthand of mathematics', only requires the ability to count from one to eleven. It is based on series of simplifies 'keys' and is easy to master giving greater ...
