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Advent calendar 2025
2 December
All 2025 advent puzzles
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Eve writes down the numbers from 1 to 10 (inclusive). In total she write down 11 digits.
Noel writes down the number from 1 to 100 (inclusive). How many digits does he write down?
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Noel writes down 9 one-digit numbers, 90 two-digit numbers and 1 three-digit number. In total, these include 1×9 + 2×90 + 3×1 =
192
digits.
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books
median
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cryptic crossnumbers
hexagons
graphs
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numbers
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folding tube maps
regular shapes
gerrymandering
square numbers
squares
angles
balancing
probability
axes
lines
partitions
sport
products
averages
means
geometric means
arrows
chess
doubling
wordplay
chalkdust crossnumber
sums
crossnumbers
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shape
perimeter
mean
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percentages
even numbers
determinants
polygons
time
ellipses
division
games
multiplaction squares
sets
cryptic clues
the only crossnumber
decahedra
prime numbers
geometry
digital products
factorials
planes
lists
consecutive integers
tournaments
consecutive numbers
rectangles
rugby
crosswords
money
ave
dice
2d shapes
multiples
neighbours
quadrilaterals
menace
colouring
coordinates
digits
algebra
volume
triangle numbers
area
remainders
odd numbers
speed
clocks
advent
scales
number
addition
routes
trigonometry
albgebra
digital clocks
grids
symmetry
bases
complex numbers
calculus
integers
surds
medians
sum to infinity
triangles
pascal's triangle
range
dominos
christmas
indices
tangents
parabolas
logic
pentagons
functions
coins
square grids
proportion
tiling
geometric mean
integration
elections
expansions
probabilty
cube numbers
polynomials
circles
shapes
xor
binary
irreducible numbers
quadratics
cards
people maths
palindromes
spheres
fractions
square roots
3d shapes
unit fractions
taxicab geometry
sequences
factors
dates
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powers
combinatorics
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multiplication
cubics
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