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