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