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