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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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addition
dominos
geometric means
star numbers
routes
chalkdust crossnumber
factors
differentiation
speed
time
surds
digital products
area
integers
calculus
means
geometry
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mean
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multiplication
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balancing
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neighbours
christmas
proportion
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coordinates
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folding tube maps
3d shapes
lines
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axes
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books
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factorials
medians
logic
grids
floors
sum to infinity
perfect numbers
integration
squares
indices
digital clocks
games
ave
2d shapes
percentages
polynomials
regular shapes
gerrymandering
prime factors
division
angles
crossnumbers
sums
prime numbers
coins
decahedra
polygons
dates
odd numbers
algebra
dice
hexagons
multiples
multiplaction squares
fractions
averages
bases
tournaments
symmetry
ellipses
powers
even numbers
arrows
quadratics
perimeter
probabilty
consecutive numbers
cryptic crossnumbers
volume
products
chocolate
money
functions
irreducible numbers
median
dodecagons
numbers
square roots
colouring
doubling
rugby
cube numbers
shape
sequences
the only crossnumber
scales
expansions
palindromes
parabolas
graphs
remainders
rectangles
unit fractions
spheres
planes
pascal's triangle
shapes
lists
sets
triangle numbers
binary
determinants
consecutive integers
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taxicab geometry
tiling
tangents
number
geometric mean
pentagons
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