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Advent calendar 2018
20 December
All 2018 advent puzzles
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Today's number is the sum of all the numbers less than 40 that are not factors of 40.
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730
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numbers
,
factors
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the only crossnumber
number
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chocolate
folding tube maps
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colouring
combinatorics
wordplay
spheres
logic
advent
products
quadrilaterals
people maths
bases
gerrymandering
dominos
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rectangles
algebra
taxicab geometry
complex numbers
sum to infinity
crossnumber
regular shapes
functions
polygons
cryptic crossnumbers
odd numbers
graphs
cryptic clues
crossnumbers
triangles
palindromes
dates
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quadratics
square roots
sums
cards
scales
median
Archive
Show me a random puzzle
▼ show ▼
▲ hide ▲
Most recent collections
Advent calendar 2020
Advent calendar 2019
Sunday Afternoon Maths LXVII
Coloured weights
Not Roman numerals
Advent calendar 2018
List of all puzzles
Tags
lines
scales
perimeter
integers
spheres
perfect numbers
wordplay
dice
unit fractions
triangle numbers
doubling
averages
proportion
means
digits
range
differentiation
area
gerrymandering
cube numbers
addition
algebra
parabolas
folding tube maps
integration
crosswords
routes
christmas
sport
star numbers
planes
palindromes
factors
division
triangles
cards
factorials
crossnumbers
geometry
circles
percentages
shapes
partitions
the only crossnumber
odd numbers
coins
sequences
number
rugby
books
digital clocks
sums
coordinates
complex numbers
graphs
advent
cryptic crossnumbers
remainders
chocolate
products
bases
volume
probabilty
pascal's triangle
square roots
hexagons
rectangles
quadrilaterals
chalkdust crossnumber
colouring
games
2d shapes
quadratics
arrows
speed
calculus
mean
functions
ellipses
dodecagons
dates
floors
multiplication
people maths
combinatorics
money
dominos
squares
elections
clocks
balancing
median
symmetry
taxicab geometry
irreducible numbers
probability
shape
tiling
trigonometry
multiples
menace
grids
surds
cryptic clues
chess
ave
crossnumber
fractions
numbers
regular shapes
time
polygons
sum to infinity
angles
logic
3d shapes
indices
square numbers
prime numbers
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