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