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