mscroggs.co.uk
mscroggs.co.uk

subscribe

Blog

Christmas card 2021

 2021-12-04 
In November, I spent some time designing this year's Chalkdust puzzle Christmas card.
The card looks boring at first glance, but contains 14 puzzles. By writing the answers to the puzzles in the triangles on the front of the card, then colouring triangles containing 1s, 2s, 5s or 6s in the right colour, you will reveal a Christmas themed picture.
If you want to try the card yourself, you can download this printable A4 pdf. Alternatively, you can find the puzzles below and type the answers in the boxes. The answers will automatically be written in the triangles, and the triangles will be coloured...
14 7 1 8 2 5 6 3 10 4 13 12 11 9 9 8 7 0 3 4 0 8 7
×1      ×1      ×1      ×1      ×1
(Click on one of these icons to react to this blog post)

You might also enjoy...

Comments

Comments in green were written by me. Comments in blue were not written by me.
@HJ: the smallest one does have 6, and Q4 is correct too. I bought the cards and had good fun solving it myself. I’m glad to find this here though to check my answers as when I did the shading it looked like the picture wasn’t quite right. Thanks for the cards Matthew, I look forward to next year’s - no pressure!
Alec
×2   ×3              Reply
The only one I'm stuck on is #6. I thought I was doing it right but I'm getting a non-integer answer. I'm assuming the heptagon in question is aligned so one of its sides sits on the diameter of the semicircle, and the opposite vertex sits on the curved edge of the semicircle. Is this wrong?
Seth C
                 Reply
The version of the card on this page doesn't check if your answers are correct, so it will colour in any number you enter as long as it has the right number of digits.
Matthew
      ×1           Reply
Wonky solution for #9? On a blank start page, answering "16" gives you red and white puzzle completions, yet we _know_ that 16 is an incorrect answer. Strange?
Attika
                 Reply
@Matthew: Thanks, I figured they did but it was good to get confirmation.
Dan
                 Reply
@Dan: one digit numbers count
Matthew
   ×1              Reply
 Add a Comment 


I will only use your email address to reply to your comment (if a reply is needed).

Allowed HTML tags: <br> <a> <small> <b> <i> <s> <sup> <sub> <u> <spoiler> <ul> <ol> <li> <logo>
To prove you are not a spam bot, please type "sexa" backwards in the box below (case sensitive):

Archive

Show me a random blog post
 2025 

Jan 2025

Christmas (2024) is over
Friendly squares
 2024 
▼ show ▼
 2023 
▼ show ▼
 2022 
▼ show ▼
 2021 
▼ show ▼
 2020 
▼ show ▼
 2019 
▼ show ▼
 2018 
▼ show ▼
 2017 
▼ show ▼
 2016 
▼ show ▼
 2015 
▼ show ▼
 2014 
▼ show ▼
 2013 
▼ show ▼
 2012 
▼ show ▼

Tags

rhombicuboctahedron reuleaux polygons sorting finite element method numbers fence posts map projections wave scattering logs european cup javascript final fantasy talking maths in public finite group electromagnetic field standard deviation chess dragon curves bubble bobble pi palindromes latex asteroids platonic solids probability mathslogicbot phd squares zines bempp exponential growth binary manchester science festival london underground mean hexapawn manchester gaussian elimination game of life quadrilaterals royal baby hyperbolic surfaces pizza cutting live stream matrix multiplication chalkdust magazine anscombe's quartet books simultaneous equations triangles signorini conditions tmip pascal's triangle preconditioning estimation curvature harriss spiral dates captain scarlet raspberry pi statistics regular expressions noughts and crosses cross stitch turtles rugby craft graphs bodmas go chebyshev stickers flexagons misleading statistics oeis error bars golden spiral games programming people maths dataset inverse matrices world cup recursion geogebra weak imposition python gerry anderson determinants hannah fry computational complexity inline code correlation matrix of minors mathsjam interpolation friendly squares datasaurus dozen weather station national lottery hats wool reddit game show probability puzzles databet arithmetic video games the aperiodical christmas card youtube a gamut of games cambridge crossnumber mathsteroids big internet math-off realhats coins folding paper numerical analysis edinburgh data visualisation ucl newcastle convergence menace data graph theory sound folding tube maps light geometry football polynomials martin gardner matt parker gather town plastic ratio approximation crochet radio 4 errors machine learning ternary pi approximation day kings speed sobolev spaces logo matrices pac-man runge's phenomenon logic tennis advent calendar draughts countdown propositional calculus 24 hour maths sport fonts frobel nine men's morris accuracy golden ratio braiding dinosaurs royal institution london trigonometry php bots pythagoras fractals boundary element methods christmas news guest posts stirling numbers matrix of cofactors

Archive

Show me a random blog post
▼ show ▼
© Matthew Scroggs 2012–2025