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Advent calendar 2024
10 December
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A number is a palindrome if it's the same when its digits are written in reverse order.
What is the sum of all the numbers between 10 and 100 that are palindromes?
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The palindromes between 10 and 100 will be the numbers 11, 22, 33, ..., 99. The sum of these is
495
.
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polynomials
tournaments
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averages
binary
numbers
unit fractions
star numbers
polygons
people maths
sequences
gerrymandering
volume
bases
planes
prime numbers
integration
decahedra
powers
coins
geometry
triangle numbers
spheres
balancing
digits
elections
factorials
colouring
triangles
numbers grids
medians
neighbours
addition
even numbers
dominos
probability
partitions
rugby
perimeter
shape
proportion
fractions
square roots
odd numbers
sport
taxicab geometry
graphs
crosswords
chess
clocks
range
dice
circles
integers
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cards
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complex numbers
hexagons
factors
folding tube maps
axes
multiplication
geometric mean
ave
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division
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symmetry
multiples
quadratics
number
trigonometry
lines
speed
mean
wordplay
digital clocks
quadrilaterals
products
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square numbers
combinatorics
indices
area
irreducible numbers
2d shapes
sum to infinity
parabolas
tiling
matrices
squares
christmas
dates
functions
consecutive integers
advent
regular shapes
percentages
coordinates
logic
sets
differentiation
arrows
chalkdust crossnumber
cryptic crossnumbers
routes
remainders
3d shapes
probabilty
angles
dodecagons
algebra
expansions
pascal's triangle
square grids
crossnumbers
floors
median
shapes
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sums
doubling
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