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 "hparg" backwards in the box below (case sensitive):

Archive

Show me a random blog post
 2020 

Jul 2020

Happy √3ϕ+π-e Approximation Day!

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

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

Archive

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