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Advent calendar 2023
3 December
All 2023 advent puzzles
~
More information
190 is the smallest multiple of 10 whose digits add up to 10.
What is the smallest multiple of 15 whose digits add up to 15?
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195
.
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Advent calendar 2024
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List of all puzzles
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circles
rectangles
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number
expansions
multiples
binary
surds
ellipses
decahedra
spheres
quadrilaterals
unit fractions
cryptic crossnumbers
triangles
lines
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probabilty
ave
tangents
sums
bases
averages
regular shapes
angles
proportion
perfect numbers
combinatorics
consecutive numbers
arrows
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2d shapes
mean
coordinates
perimeter
percentages
digital clocks
remainders
digits
cube numbers
medians
sequences
digital products
folding tube maps
polygons
volume
sport
factorials
algebra
scales
taxicab geometry
determinants
3d shapes
coins
functions
pentagons
calculus
gerrymandering
trigonometry
shapes
powers
partitions
books
geometry
irreducible numbers
cards
balancing
time
means
odd numbers
games
squares
the only crossnumber
elections
chocolate
products
hexagons
colouring
square roots
even numbers
albgebra
dice
range
neighbours
complex numbers
factors
consecutive integers
advent
cryptic clues
multiplication
parabolas
planes
floors
money
crosswords
indices
clocks
doubling
geometric means
palindromes
prime numbers
logic
dominos
chalkdust crossnumber
median
grids
square numbers
integers
christmas
addition
matrices
shape
rugby
dodecagons
differentiation
quadratics
numbers
sets
cubics
speed
sum to infinity
fractions
star numbers
triangle numbers
axes
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area
tiling
routes
menace
people maths
wordplay
chess
square grids
symmetry
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division
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