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