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