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Advent calendar 2023
3 December
All 2023 advent puzzles
~
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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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routes
complex numbers
probabilty
circles
3d shapes
multiples
consecutive integers
folding tube maps
neighbours
clocks
wordplay
factors
taxicab geometry
menace
integration
functions
proportion
averages
time
albgebra
square numbers
quadrilaterals
tournaments
trigonometry
star numbers
odd numbers
addition
quadratics
spheres
floors
parabolas
products
surds
dates
indices
volume
fractions
sport
ellipses
shape
range
palindromes
the only crossnumber
colouring
algebra
logic
axes
bases
elections
means
factorials
regular shapes
perimeter
cube numbers
coordinates
digital clocks
pascal's triangle
balancing
irreducible numbers
symmetry
geometric means
gerrymandering
tiling
square grids
chalkdust crossnumber
shapes
books
consecutive numbers
sequences
probability
sets
graphs
powers
sum to infinity
angles
christmas
squares
games
even numbers
perfect numbers
remainders
calculus
dodecagons
dice
digital products
money
speed
chess
rectangles
number
determinants
arrows
doubling
cards
prime numbers
pentagons
square roots
people maths
triangles
cryptic crossnumbers
digits
matrices
planes
chocolate
lines
coins
rugby
crosswords
geometric mean
area
multiplication
ave
geometry
advent
medians
combinatorics
binary
numbers
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triangle numbers
median
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unit fractions
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dominos
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2d shapes
division
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