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