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