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