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