mscroggs.co.uk
mscroggs.co.uk

subscribe

Blog

Christmas card 2018

 2018-12-08 
Just like last year and the year before, TD and I spent some time in November this year designing a Chalkdust puzzle Christmas card.
The card looks boring at first glance, but contains 10 puzzles. By splitting the answers into pairs of digits, then drawing lines between the dots on the cover for each pair of digits (eg if an answer is 201304, draw a line from dot 20 to dot 13 and another line from dot 13 to dot 4), you will reveal a Christmas themed picture. Colouring the region of the card labelled R red or orange will make this picture even nicer.
If you want to try the card yourself, you can download this pdf. Alternatively, you can find the puzzles below and type the answers in the boxes. The answers will be automatically be split into pairs of digits, lines will be drawn between the pairs, and the red region will be coloured...
If you enjoy these puzzles, then you'll almost certainly enjoy this year's puzzle Advent calendar.

Similar posts

Christmas card 2019
Christmas card 2017
Christmas card 2016
Christmas (2019) is over

Comments

Comments in green were written by me. Comments in blue were not written by me.
Someone told me I would like this puzzle and they were right!
Blaine
×1                 Reply
@Carmel: It's not meant to check your answers. It only shows up red if the number you enter cannot be split into valid pairs (eg the number has an odd number of digits or one of the pairs of digits is greater than 20).
Matthew
                 Reply
The script for checking the answers doesn't work properly
Carmel
                 Reply
Thank you Shawn!
SueM
                 Reply
So satisfying!
Heather
×1                 Reply
Great puzzle problems! Hint on #9: try starting with an analogous problem using smaller numbers (e.g. 3a + 10b). This helped me to see what I had to do more generally.
Noah
   ×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>
To prove you are not a spam bot, please type "tnemges" backwards in the box below (case sensitive):

Archive

Show me a random blog post
 2020 

May 2020

A surprising fact about quadrilaterals
Interesting tautologies

Mar 2020

Log-scaled axes

Feb 2020

PhD thesis, chapter ∞
PhD thesis, chapter 5
PhD thesis, chapter 4
PhD thesis, chapter 3
Inverting a matrix
PhD thesis, chapter 2

Jan 2020

PhD thesis, chapter 1
Gaussian elimination
Matrix multiplication
Christmas (2019) is over
 2019 
▼ show ▼
 2018 
▼ show ▼
 2017 
▼ show ▼
 2016 
▼ show ▼
 2015 
▼ show ▼
 2014 
▼ show ▼
 2013 
▼ show ▼
 2012 
▼ show ▼

Tags

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

Archive

Show me a random blog post
▼ show ▼
© Matthew Scroggs 2012–2020