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