30 Second Challenge has been developed to improve numeracy skills in arithmetic and mental mathematics. These original brain training games, which make mathematics fun for all ages, increase powers of memory and speed. Spend 15 minutes each day tackling the carefully graded challenges and, in no time at all, you will be able to perform mental gymnastics quickly and accurately.
The 3 Level Challenge E-Books are collections of fun challenges for adults and children to improve their mental arithmetic skills. Each e-book contains 48 challenges at Beginner, Intermediate and Advanced levels, making a total of 144 challenges per e-book.Shop Now