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