Uploaded April 2021 | Updated September 2026, 2 weeks ago

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Check out kiwico.com/standupmaths and get 50% off your first month of any subscription!

Subscribe to Steve Mould’s channel. I sent him the next video challenge along with the Monomatch cards. youtube.com/stevemould

Support me on Patreon and get sent three "Monomatch Myriad" cards to check.
patreon.com/posts/50645477

Here is the bonus 'behind the cards' video on how I made Monomatch Myriad.
youtu.be/_l6h8v6R7yo

It occurs to me it would be foolish to not provide Amazon referral links but don’t forget about your local independent toy retailers!
USA SPOT IT: amazon.com/s?k=spot+it&ref=nb_sb_noss?_encoding=UTF8&tag=stanupmath-20
UK DOBBLE: amazon.co.uk/s?k=dobble&ref=sr_1_1?_encoding=UTF8&tag=stanupmath-21

This is the student video I mentioned:
"How to make the card game Dobble (and the Maths behind it!)"
youtube.com/watch?v=oyqD1Sg5M4Q

Double Dobble
aperiodical.com/2020/05/the-big-lock-down-math-off-match-22

Droste Dobble
christianp.github.io/droste-dobble
mathsjam.com/assets/talks/2015/ChristianPerfect-DrosteDobble/#

"A finite projective plane exists when the order n is a power of a prime."
mathworld.wolfram.com/ProjectivePlane.html

Finite projective plane of order 4 image from here:
demonstrations.wolfram.com/ProjectivePlanesOfLowOrder

Catch the match!
boardgamegeek.com/boardgame/1321/catch-match/credits

The American Mathematical Monthly
Vol. 13, No. 11, Nov., 1906 jstor.org/stable/i349244
Vol. 14, No. 5, May, 1907 jstor.org/stable/i349250

CORRECTIONS
- At 06:35 Dimitri Provoost spotted that some of the star and cross symbols on the diagonal red lines are accidentally swapped around. Good spot Dimitri!
- I think once or twice I say "card" when I mean "symbol". I blame too much time spent with projective planes.
- Let me know if you spot any other mistakes!

Thanks to my Patreon supporters who keep me well-stocked with children's card games. And now 101 pentagons all featuring a happy little house.

patreon.com/standupmaths

Filming and grading by Alex Genn-Bash
Editing by Matt Parker
Graphics by Sam Hartburn and Matt Parker
Music by Howard Carter
Design by Simon Wright and Adam Robinson

MATT PARKER: Stand-up Mathematician
Website: standupmaths.com
US book: penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker
UK book: mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback