This issue has plenty of material on prime numbers, and the cover depicts, amidst a generous sprinkling of primes, the famous Greek mathematician Eratosthenes who made important contributions to Mathematics and Geography. Art and Mathematics section features some incredible ambigrams by Punya Misra and Gaurav Bhatnagar and the math behind them. A Teacher’s Diary on Classroom Assessment which is a joint effort of the A&P and IAA teams and is an attempt to translate the vision of CCE into practice. ‘How to Prove It’ which presents through case studies-themes, approaches and strategies connected with proof. The pullout this time focuses on subtraction.
We featured in this issue one of the great characters of twentieth century mathematics: Paul Erdős. This was appropriate as 2013 is the centenary year of his birth. Next, there was an article on the derivation of Brahmagupta’s formula for area of a cyclic quadrilateral via the use of Heron’s formula. In ‘Classroom’ we had an essay on Angles which explores some pitfalls that can waylay the learner. In Math Club we had a piece on the combinatorics of Braille.
In this issue we showed how to make an origami skeletal dodecahedron using paper but without the use of scissors or adhesives. We also showed how a well-known identity for the sum of the cubes of the natural numbers generalizes in a non-obvious way. Next we had an article on PIE – the Principle of Inclusion and Exclusion. Following that we had an article on Harmonic Triples. Next, we had a review of one of Polya’s most famous books. We started a new series on Problem Solving in Geometry. In ‘Tech Space’ we focused on problem solving using Geogebra.
In this issue, which appropriately featured Srinivasa Ramanujan on the cover, we started with Lagrange’s Four Squares Theorem followed by articles on games of chance; on the axiomatic basis of origami, and an unexpected construction possible under the rules of paper folding; on a beautiful theorem of Euclidean geometry called Viviani’s theorem; and on using a spreadsheet to explore the famous conundrum known as the ‘Monty Hall problem’. We also covered one of the premier events in mathematics education, held once in four years – ICME 12, which took place in Seoul, South Korea in July 2012. Following this we had articles on the role of open-ended questioning in classroom teaching; on pitfalls in the teaching of the method of induction. In the ‘Math Club’ column we studied a seemingly commonplace problem from the region shared by geometry, combinatorics and sequences. The ‘Pullout’ featured the teaching of decimal fractions. The ‘Review’ page features one of the best used sites in school level mathematics: the site belonging to the NRICH project of the University of Cambridge.
With this issue we started the publication of a national level magazine, addressed directly to teachers and students at the middle and high school level. The inaugural issue had a lot of material on the Pythagorean theorem and on themes related to this theorem. There was a ‘proof without words’ from the late Prof A R Rao; articles on paper folding, on the use of spreadsheets, on a way of classifying quadrilaterals, on the use of math portfolios in teaching, and on teaching fractions at the primary level.

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