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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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dominos
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grids
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complex numbers
coins
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geometric means
Archive
Show me a random puzzle
▼ show ▼
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Most recent collections
Advent calendar 2023
Advent calendar 2022
Advent calendar 2021
Advent calendar 2020
List of all puzzles
Tags
shapes
trigonometry
quadrilaterals
geometric means
indices
multiples
geometric mean
circles
quadratics
menace
percentages
irreducible numbers
partitions
graphs
prime numbers
albgebra
decahedra
spheres
routes
cryptic crossnumbers
chocolate
functions
symmetry
tiling
probabilty
crossnumbers
pascal's triangle
complex numbers
cryptic clues
christmas
floors
volume
scales
division
calculus
pentagons
star numbers
multiplication
time
crossnumber
chess
speed
parabolas
tournaments
digital clocks
range
games
means
rugby
tangents
dates
cubics
integers
rectangles
determinants
consecutive numbers
perfect numbers
arrows
taxicab geometry
triangle numbers
square roots
sums
coordinates
digital products
people maths
wordplay
grids
balancing
area
sum to infinity
lines
regular shapes
books
logic
even numbers
unit fractions
binary
folding tube maps
remainders
cube numbers
perimeter
factors
crosswords
averages
proportion
square numbers
products
elections
combinatorics
triangles
polynomials
shape
clocks
algebra
chalkdust crossnumber
dodecagons
expansions
doubling
polygons
number
sequences
sport
ellipses
matrices
cards
odd numbers
coins
dominos
the only crossnumber
surds
gerrymandering
angles
probability
axes
fractions
ave
bases
factorials
differentiation
sets
addition
numbers
advent
palindromes
squares
hexagons
geometry
3d shapes
dice
planes
2d shapes
money
median
mean
consecutive integers
integration
digits
colouring
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