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