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Advent calendar 2016

7 December

Put the digits 1 to 9 (using each digit once) in the boxes so that the three digit numbers formed (reading left to right and top to bottom) have the desired properties written by their rows and columns.
multiple of 25
today's number
all digits even
multiple of 91multiple of 7cube number
Tags: grids, numbers

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

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