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