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