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