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