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