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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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irreducible numbers
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balancing
gerrymandering
consecutive integers
indices
differentiation
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wordplay
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xor
axes
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scales
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folding tube maps
square grids
perimeter
division
square roots
speed
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menace
spheres
shape
powers
lines
cryptic crossnumbers
logic
neighbours
cryptic clues
percentages
number
tangents
odd numbers
digital products
multiples
remainders
taxicab geometry
products
sets
lists
2d shapes
geometry
ave
people maths
dominos
cards
square numbers
floors
ellipses
chalkdust crossnumber
dice
the only crossnumber
bases
squares
cube numbers
3d shapes
coins
colouring
algebra
parabolas
consecutive numbers
cubics
tiling
quadratics
area
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sum to infinity
rugby
volume
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even numbers
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