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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 2025
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Tags
unit fractions
perimeter
elections
chess
people maths
pascal's triangle
geometric means
the only crossnumber
angles
bases
spheres
consecutive numbers
division
expansions
combinatorics
books
gerrymandering
algebra
symmetry
lists
chocolate
binary
tiling
time
products
probabilty
xor
square roots
means
games
folding tube maps
perfect numbers
coins
rectangles
graphs
powers
digital products
mean
scales
sum to infinity
range
balancing
dodecagons
circles
wordplay
triangles
percentages
factorials
coordinates
sets
quadratics
hexagons
multiples
2d shapes
medians
sequences
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digits
albgebra
factors
surds
chalkdust crossnumber
area
shapes
integration
calculus
regular shapes
geometry
taxicab geometry
lines
ellipses
digital clocks
triangle numbers
colouring
crosswords
planes
partitions
irreducible numbers
decahedra
cards
functions
median
square numbers
ave
probability
odd numbers
complex numbers
advent
multiplication
averages
clocks
volume
cryptic crossnumbers
numbers
remainders
geometric mean
proportion
grids
crossnumbers
routes
consecutive integers
indices
dates
parabolas
fractions
sport
dice
determinants
money
star numbers
neighbours
axes
differentiation
square grids
3d shapes
dominos
floors
cubics
multiplaction squares
tournaments
christmas
sums
prime numbers
prime factors
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number
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menace
logic
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cube numbers
squares
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rugby
addition
arrows
even numbers
integers
pentagons
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