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Puzzles

5 December

I make a book by taking 111 sheets of paper, folding them all in half, then stapling them all together through the fold. I then number the pages from 1 to 444.
Today's number is the sum of the two page numbers on the centre spread of my book.
Tags: numbers, books

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

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