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Advent calendar 2016
1 December
All 2016 advent puzzles
~
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One of the digits of today's number was removed to leave a two digit number. This two digit number was added to today's number. The result was 619.
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563
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Advent calendar 2025
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area
quadratics
prime numbers
range
multiplaction squares
consecutive integers
chalkdust crossnumber
scales
factors
even numbers
2d shapes
graphs
cubics
square grids
angles
perimeter
symmetry
probability
prime factors
lines
polygons
powers
colouring
tournaments
medians
balancing
volume
averages
bases
decahedra
games
irreducible numbers
surds
palindromes
complex numbers
spheres
star numbers
sets
expansions
ellipses
triangles
routes
multiples
numbers
factorials
cryptic clues
people maths
logic
arrows
dates
coordinates
geometric mean
hexagons
odd numbers
calculus
parabolas
money
determinants
3d shapes
digital products
ave
proportion
albgebra
neighbours
menace
coins
dominos
multiplication
pascal's triangle
cards
remainders
tiling
products
differentiation
tangents
mean
squares
sums
perfect numbers
speed
folding tube maps
time
number
matrices
geometry
lists
crosswords
cube numbers
dodecagons
rectangles
sport
taxicab geometry
trigonometry
digital clocks
division
regular shapes
chess
doubling
binary
unit fractions
functions
square roots
elections
partitions
books
shape
axes
shapes
fractions
dice
chocolate
sequences
crossnumbers
wordplay
integration
clocks
rugby
indices
sum to infinity
cryptic crossnumbers
grids
floors
triangle numbers
planes
gerrymandering
integers
probabilty
pentagons
consecutive numbers
polynomials
geometric means
median
means
circles
combinatorics
quadrilaterals
square numbers
the only crossnumber
addition
xor
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