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Advent calendar 2025
19 December
All 2025 advent puzzles
~
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Eve uses the digits 1, 2, 3, 4, 5, 6, 7, 8 and 9 to write five square numbers (using each digit exactly once). What is largest square number that she made?
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The square numbers must be 1, 9, 25, 36, and
784
.
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Tags
coins
chalkdust crossnumber
digits
medians
sequences
irreducible numbers
elections
people maths
probabilty
sum to infinity
algebra
dates
cubics
indices
dominos
tournaments
numbers
symmetry
geometric mean
shapes
factorials
menace
crossnumbers
square roots
speed
sport
clocks
quadratics
spheres
square grids
cube numbers
dice
number
sets
floors
cryptic crossnumbers
odd numbers
prime numbers
means
circles
digital products
factors
rectangles
polygons
partitions
3d shapes
regular shapes
xor
remainders
pentagons
dodecagons
time
probability
matrices
star numbers
cryptic clues
albgebra
decahedra
median
consecutive numbers
sums
perimeter
games
fractions
coordinates
combinatorics
grids
2d shapes
shape
chess
complex numbers
trigonometry
calculus
folding tube maps
consecutive integers
lists
chocolate
colouring
routes
taxicab geometry
palindromes
cards
functions
the only crossnumber
multiples
doubling
square numbers
range
wordplay
tangents
axes
mean
balancing
polynomials
christmas
averages
money
gerrymandering
rugby
planes
expansions
logic
prime factors
crosswords
bases
squares
unit fractions
integration
triangles
ave
neighbours
angles
powers
quadrilaterals
volume
arrows
proportion
even numbers
parabolas
division
geometry
integers
triangle numbers
differentiation
lines
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scales
perfect numbers
digital clocks
binary
multiplaction squares
percentages
surds
addition
multiplication
geometric means
products
determinants
tiling
pascal's triangle
ellipses
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books
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hexagons
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