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