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