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