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