# 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

spheres complex numbers balancing means scales sum to infinity chalkdust crossnumber crosswords sums probability hexagons time parabolas volume routes indices mean dice christmas regular shapes numbers perfect numbers pascal's triangle ave dates trigonometry speed cards lines averages taxicab geometry fractions palindromes calculus integers advent folding tube maps angles factors clocks division square numbers odd numbers menace irreducible numbers prime numbers surds games sport planes ellipses cube numbers triangles geometry perimeter shapes factorials rectangles number coins people maths shape crossnumbers digits 2d shapes chocolate doubling differentiation multiples triangle numbers remainders arrows integration partitions quadratics coordinates squares proportion books bases wordplay chess symmetry functions polygons graphs colouring 3d shapes unit fractions sequences probabilty rugby floors square roots dodecagons cryptic clues area money circles cryptic crossnumbers percentages grids star numbers multiplication algebra logic addition## 14 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.

- | + | = 10 | |||

÷ | + | ÷ | |||

÷ | + | = 3 | |||

+ | - | ÷ | |||

+ | × | = 33 | |||

= 7 | = 3 | = 3 |