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