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