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