# Advent calendar 2018

## Archive

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#### Sunday Afternoon Maths LXVII

Coloured weightsNot Roman numerals

#### Advent calendar 2018

#### Sunday Afternoon Maths LXVI

Cryptic crossnumber #2#### Sunday Afternoon Maths LXV

Cryptic crossnumber #1Breaking Chocolate

Square and cube endings

List of all puzzles

## Tags

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

Put the digits 1 to 9 (using each digit exactly once) in the boxes so that the sums are correct. The sums should be read left to right and top to bottom ignoring the usual order of operations. For example, 4+3×2 is 14, not 10. Today's number is the product of the numbers in the red boxes.

+ | + | = 11 | |||

- | + | × | |||

+ | - | = 11 | |||

- | - | - | |||

+ | + | = 11 | |||

= -11 | = 11 | = 11 |