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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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prime numbers
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Archive
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Most recent collections
Advent calendar 2024
Advent calendar 2023
Advent calendar 2022
Advent calendar 2021
List of all puzzles
Tags
games
tiling
sport
trigonometry
ellipses
multiples
pascal's triangle
star numbers
rugby
money
coins
mean
ave
median
range
probabilty
palindromes
geometry
3d shapes
crossnumber
differentiation
remainders
calculus
proportion
square numbers
balancing
factors
taxicab geometry
arrows
binary
percentages
digital products
combinatorics
clocks
probability
crossnumbers
sets
digits
coordinates
2d shapes
even numbers
surds
cryptic clues
folding tube maps
bases
crosswords
volume
dodecagons
addition
graphs
angles
digital clocks
medians
books
tournaments
chocolate
integers
cube numbers
squares
floors
parabolas
spheres
axes
area
odd numbers
scales
polynomials
menace
doubling
prime numbers
dice
neighbours
expansions
indices
geometric means
sums
geometric mean
wordplay
shape
fractions
routes
time
circles
numbers grids
decahedra
triangles
pentagons
gerrymandering
hexagons
products
consecutive integers
chess
planes
people maths
triangle numbers
multiplication
irreducible numbers
algebra
quadrilaterals
speed
shapes
perimeter
matrices
means
number
determinants
consecutive numbers
regular shapes
symmetry
elections
numbers
grids
square roots
averages
sum to infinity
powers
albgebra
polygons
unit fractions
chalkdust crossnumber
lines
complex numbers
functions
division
square grids
logic
integration
cryptic crossnumbers
factorials
dominos
dates
colouring
rectangles
the only crossnumber
cubics
partitions
tangents
quadratics
cards
sequences
advent
perfect numbers
christmas
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