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Advent calendar 2019
24 December
All 2019 advent puzzles
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There are six 3-digit numbers with the property that the sum of their digits is equal to the product of their digits. Today's number is the largest of these numbers.
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The digits of the number must be 1, 2 and 3, so the largest number is
321
.
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percentages
scales
triangle numbers
products
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the only crossnumber
prime numbers
digital clocks
digits
geometric means
addition
sequences
geometric mean
range
folding tube maps
sets
shapes
matrices
remainders
quadratics
integers
books
neighbours
tournaments
cards
perimeter
sum to infinity
routes
lists
partitions
fractions
chocolate
dice
even numbers
dates
speed
multiplication
multiples
lines
ellipses
polynomials
circles
pentagons
palindromes
square grids
balancing
angles
doubling
number
area
sport
dodecagons
christmas
irreducible numbers
star numbers
tiling
dominos
expansions
functions
calculus
decahedra
mean
advent
triangles
taxicab geometry
parabolas
coins
medians
means
cryptic crossnumbers
symmetry
crossnumbers
factorials
axes
probabilty
unit fractions
cube numbers
regular shapes
odd numbers
trigonometry
colouring
determinants
square roots
numbers
elections
grids
gerrymandering
arrows
cubics
binary
proportion
volume
combinatorics
tangents
consecutive numbers
rugby
albgebra
chess
floors
games
time
sums
multiplaction squares
polygons
shape
3d shapes
probability
cryptic clues
square numbers
digital products
planes
averages
people maths
complex numbers
coordinates
xor
division
consecutive integers
money
chalkdust crossnumber
algebra
pascal's triangle
ave
median
spheres
wordplay
logic
bases
hexagons
powers
rectangles
differentiation
indices
quadrilaterals
perfect numbers
crosswords
squares
factors
geometry
clocks
prime factors
graphs
integration
surds
menace
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