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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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Most recent collections
Advent calendar 2023
Advent calendar 2022
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List of all puzzles
Tags
elections
tournaments
routes
cryptic clues
mean
bases
squares
symmetry
coordinates
calculus
games
logic
money
shapes
consecutive numbers
partitions
cards
quadrilaterals
parabolas
sum to infinity
expansions
factorials
3d shapes
number
median
wordplay
means
rectangles
albgebra
cubics
trigonometry
remainders
crosswords
gerrymandering
pentagons
binary
taxicab geometry
palindromes
irreducible numbers
polynomials
even numbers
division
tiling
spheres
chocolate
surds
digital products
area
ave
star numbers
quadratics
percentages
factors
odd numbers
graphs
hexagons
shape
combinatorics
multiples
differentiation
pascal's triangle
dominos
crossnumber
christmas
time
triangles
menace
probability
colouring
triangle numbers
ellipses
sums
dodecagons
prime numbers
polygons
products
averages
2d shapes
planes
fractions
folding tube maps
complex numbers
perimeter
dice
range
volume
floors
chalkdust crossnumber
digits
consecutive integers
cryptic crossnumbers
speed
circles
advent
axes
people maths
balancing
chess
algebra
numbers
cube numbers
sets
sequences
angles
proportion
books
matrices
coins
clocks
indices
lines
scales
grids
rugby
the only crossnumber
dates
determinants
square roots
regular shapes
digital clocks
multiplication
sport
integers
geometric means
tangents
crossnumbers
geometric mean
functions
unit fractions
square numbers
decahedra
geometry
probabilty
perfect numbers
addition
doubling
arrows
integration
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