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Advent calendar 2017
16 December
All 2017 advent puzzles
~
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There are
204 squares (of any size) in an 8×8 grid of squares
. Today's number is the number of rectangles (of any size) in a 2×19 grid of squares
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570
Tags:
square numbers
,
squares
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grids
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Most recent collections
Advent calendar 2023
Advent calendar 2022
Advent calendar 2021
Advent calendar 2020
List of all puzzles
Tags
remainders
chalkdust crossnumber
games
complex numbers
trigonometry
percentages
addition
digital clocks
ave
taxicab geometry
crosswords
menace
tiling
grids
triangle numbers
balancing
binary
multiples
chess
even numbers
averages
circles
square roots
digits
pentagons
squares
albgebra
integers
area
crossnumber
doubling
geometric means
coins
triangles
planes
speed
polygons
calculus
sums
crossnumbers
unit fractions
sport
shape
range
consecutive numbers
advent
money
star numbers
matrices
spheres
regular shapes
means
integration
lines
square numbers
median
bases
coordinates
shapes
cube numbers
cryptic crossnumbers
gerrymandering
cards
geometric mean
routes
people maths
number
perfect numbers
indices
volume
wordplay
algebra
sequences
graphs
differentiation
sets
consecutive integers
perimeter
2d shapes
factors
tangents
irreducible numbers
odd numbers
elections
division
factorials
ellipses
angles
proportion
dominos
expansions
the only crossnumber
partitions
tournaments
combinatorics
mean
axes
rugby
digital products
time
hexagons
chocolate
surds
palindromes
polynomials
logic
dates
colouring
symmetry
rectangles
prime numbers
christmas
quadratics
functions
probability
probabilty
products
folding tube maps
books
pascal's triangle
numbers
decahedra
3d shapes
multiplication
cryptic clues
parabolas
dice
scales
dodecagons
clocks
quadrilaterals
cubics
floors
sum to infinity
determinants
arrows
geometry
fractions
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