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people maths means menace determinants sum to infinity spheres christmas probabilty squares rectangles unit fractions factorials geometric mean even numbers shapes routes algebra dice products square numbers decahedra pascal's triangle medians logic cubics sequences shape percentages indices mean combinatorics neighbours dates chalkdust crossnumber integration partitions crossnumbers odd numbers polynomials lists fractions integers symmetry perimeter quadratics doubling trigonometry surds differentiation regular shapes gerrymandering chocolate grids digits games division quadrilaterals triangles binary cryptic crossnumbers axes median expansions lines hexagons sport taxicab geometry coordinates advent calculus geometry multiplication albgebra balancing number perfect numbers the only crossnumber sums ellipses clocks star numbers multiplaction squares 2d shapes geometric means prime factors palindromes parabolas consecutive integers tangents multiples square roots 3d shapes sets ave probability functions planes polygons arrows range xor prime numbers circles cryptic clues matrices irreducible numbers chess complex numbers volume crosswords cards colouring addition averages dodecagons pentagons proportion area time graphs scales speed consecutive numbers triangle numbers coins dominos tiling bases powers digital clocks folding tube maps numbers factors digital products square grids cube numbers money books remainders rugby elections tournaments wordplay angles floors