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