Click here to win prizes by solving the puzzle Advent calendar.
Click here to win prizes by solving the puzzle Advent calendar.


Advent calendar 2017

13 December

A book has 754 pages (numbered 1 to 754: page 1 is on the left of the first double page spread, and page 754 is on the right of the final double page spread). What do the page numbers of the middle two-page spread add up to?
Tags: numbers


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


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