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