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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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tiling
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symmetry
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digital clocks
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trigonometry
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perfect numbers
star numbers
multiplication
quadrilaterals
integration
cube numbers
powers
2d shapes
chess
graphs
multiplaction squares
colouring
ellipses
fractions
consecutive numbers
sums
ave
median
square grids
rectangles
shapes
probability
polynomials
percentages
arrows
means
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spheres
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volume
unit fractions
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xor
perimeter
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averages
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