Larkin, J. H., & Simon, H. A. (1987). Why a diagram may be worth ten thousand words. Cognitive Science, 11(1), 65-100.
Instead of calculating 37% of 850 by (37/100)*850 , the PDF teaches you the reciprocal percentage method: 37% of 850 = 50% of 850 - 13% of 850 . This breakdown takes 3 seconds mentally. m tyra quicker maths pdf
Kilpatrick, J., Swafford, J., & Findell, B. (2001). Adding it up: Helping children understand math. National Academy Press. Larkin, J
: The book emphasizes developing an intuitive grasp of numbers to perform complex calculations mentally without using pen and paper. Vedic Foundations m tyra quicker maths pdf