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