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