On 30–31 October 2020, we hosted a 24 hour maths magic show.

At 21:00 GMT, Katie Steckles (, , ) welcomed everyone to the show at youtu.be/Uuqrh5sdK8g.

At 21:00-21:30 GMT, Zoe Griffiths (, ) joined us and successfully memorised the results of 40 coin flips. Zoe is involved in upcoming events with think-maths.co.uk, mathsinspiration.com, and cosmicshambles.com/ninelessons.

At 21:30-22:00 GMT, Phil Bell-Young (, ) joined us to perform a card trick that everyone could also try at home.

At 22:00-22:30 GMT, Matt Parker (, , ) joined us to (eventually) perform a very unlikely card trick.

At 22:30 GMT, Zoe Griffiths (, ) took over from Katie to introduce our next guests…

At 22:30-23:00 GMT, Susan Okereke (, , ) multiplied some two digit numbers by 11 very quickly, and showed us how to multiply quickly by 6, 7, 8 and 9 using her hands.

At 23:00-23:30 GMT, Matt Pritchard (, ) showed us some mind-bending illusions. At wordsonwonder.com, you can find a collection of interviews with Matt about wonder.

At 23:15 GMT, Katie Steckles (, , ) appeared on Watsonathon to tell Mark Watson and Tim Key what we were doing.

At 23:30-0:00 GMT, Ian Kendall (, ) made a dollar disappear. Ian runs courses for aspiring magicians: find out more at virtualmagicshow.com/courses.

At 0:00 GMT, Ben Sparks (, ) took over from Zoe to introduce our next guests…

At 0:00-0:30 GMT, Raj Shah (, ) impressed Ben with some magic grids of numbers.

At 0:30-1:00 GMT, Tom Crawford (, , ) worked out how to do Ben’s dice and then performed it himself for the very first time.

At 1:00-1:30 GMT, Matthew Scroggs (, ) taught some matchboxes to beat Ben at Nim. He also treated us by releasing a new issue of Chalkdust, a magazine for the mathematically curious

At 1:30 GMT, Samuel Hansen (, ) took over from Ben to introduce our next guests…

At 1:30-2:00 GMT, Gord! (, ) impressed us with some square arrangements of cards.

At 2:00-2:30 GMT, Ron Lancaster showed us a trick involving cards and dice.

At 2:30-3:00 GMT, Scott Kim (, ) amazed us with some ambigrams.

At 3:00 GMT, Sydney Weaver (, ) took over from Samuel to introduce our next guests…

At 3:00-3:30 GMT, Peter Kagey (, ) worked out the missing number from some sets of five numbers. There is a page on Peter’s website that allows you to experiment with this trick yourself.

At 3:30-4:00 GMT, Jack Harrison considered 1 + 2 + 3 + 4 + 5…

At 4:00-4:30 GMT, Paddy Moore () showed us some simple but impressive card tricks.

At 4:30 GMT, Julia Collins () took over from Sydney to introduce our next guests…

At 4:30-5:00 GMT, Dan Finkel (, ) used numbers chosen by the YouTube chat to perform a trick.

At around 5:00 GMT, Katie Steckles (, , ) appeared on Watsonathon to tell Mark Watson how our stream was going.

At 5:00-5:30 GMT, Ayliean MacDonald (, , ) tore a loop of fabric in half to make two interlinked loops of fabric.

At 5:30-6:00 GMT, James Arthur (, ) showed us a trick involving addition of unit fractions.

At 6:00 GMT, Katie Steckles (, , ) took over from Julia to introduce our next guests…

At 6:00-6:30 GMT, Jimi Jibodu showed us card tricks by Bob Hummer.

At 6:30-7:00 GMT, Tom Briggs (, ) worked out fifth roots at incredible speed.

At 7:00-7:30 GMT, Tom Scott (, ) brought along paper and scissors to do some folding and cutting for a trick with Katie Steckles.

At 7:30 GMT, Chris Smith (, ) took over from Katie to introduce our next guests…

At 7:30-8:00 GMT, Sydney Weaver (, ) performed some amazing feats with Rubik’s cubes.

At 8:00-8:30 GMT, Tony Mann (, ) showed us a card trick from his primary school days.

At 8:30-9:00 GMT, Kyle D Evans (, ) showed us a trick on a clock.

At 9:00 GMT, the stream moved to youtu.be/6XTV6FWOfLg and Bobby Seagull (, , ) welcomed everyone back to the show.

At 9:00-9:30 GMT, Alison Eves () worked out Bobby’s birthday. Alison coordinates maths masterclasses for the Royal Institution (, ) .

At 9:30-10:00 GMT, Chris Smith (, ) hid the number 123 in a skull, confused Bobby with a clock, and did a song. Chris sends out a weekly maths newsletter full of puzzles, lesson ideas, resources, and trivia. Email aap03102@gmail.com and Chris will be happy to sign you up for the newsletter!

At 10:00-10:30 GMT, Julia Collins () did a trick with 5 red and 5 black cards. Julia’s latest book, Numbers in Minutes is about 200 essential and interesting numbers.

At 10:30 GMT, Sophie Maclean (, , ) took over from Bobby to introduce our next guests. You can listen to Sophie’s podcast on Spotify.

At 10:30-11:00 GMT, Jo Morgan () was the volunteer for a trick performed by Sophie, then Sophie and Jo worked out how the trick worked.

At 11:00-11:30 GMT, Kevin Houston (, , ) performed some card tricks using his unbelievable ability to perform a perfect shuffle.

At 11:30-12:00 GMT, Tiago Hirth performed lots of tricks. Many of the involved a chain and a ring.

At 12:00 GMT, Fran Watson () took over from Bobby to introduce our next guests…

At 12:00-12:30 GMT, Bobby Seagull (, , ) made Fran think about an orange kangaroo.

At 12:30-13:00 GMT, Laurence O’Toole worked out Fran’s number after 8 questions even though she lied.

At 13:00-13:30 GMT, Goran Newsum () got Katie’s disembodied hands to perform a dice trick.

At around 13:30 GMT, Katie Steckles (, , ) appeared on Watsonathon to tell Mark Watson how our stream was going.

At 13:30 GMT, Katie Oldfield () took over from Fran to introduce our next guests…

At 13:30-14:00 GMT, Joe M. Turner (, , ) did some magic tricks with dice. His next virtual show is on 15 November at 7pm EST.

At 14:00-14:30 GMT, Colin Wright (, ) dealt a deck into 13 piles of 4 then made four straights from the piles. But is it always possible, or was he just lucky?

At 14:30-15:00 GMT, Fran Watson () tried to find the S-I-X O-F H-E-A-R-T-S using M-A-T-H-S. Fran is running a maths and paper folding workshop for teachers on 11 November.

At 15:00 GMT, James Arthur (, ) took over from Katie to introduce our next guests…

At 15:00-15:30 GMT, Vicky Neale (, ) folded some paper and found a parabola, then drew some straight lines to find some other surprise curves. Vicky’s new book, Why Study Mathematics? came out this week. There are templates for some interesting curve stitching on her website.

At 15:30-16:00 GMT, Simon Allen made James divide some numbers between 7, 11 and 13.

At 16:00-16:30 GMT, James Grime (, ) got the other James to multiply some one digit numbers together, the guessed a missing digit. On 20 November, James is running virtual maths retreats with Katie Steckles for year 7-9 and year 10-11 students.

At 16:30 GMT, Jon Martin () took over from James to introduce our next guests…

At 16:30-17:00 GMT, Ben Sparks (, ) showed Jon a card trick, then taught Jon how to do it.

At 17:00-17:30 GMT, Katie Steckles (, , ) showed Jon a trick involving four digit numbers made by three rods. On 20 November, Katie is running virtual maths retreats with James Grime for year 7-9 and year 10-11 students.

At 17:30-18:00 GMT, Andrew Jeffrey () showed us a metal squircle, and gave Jon a fantastic prize…

At 18:00 GMT, James Grime (, ) took over from Jon to introduce our next guests…

At 18:00-18:30 GMT, Hana Ayoob (, , ) showed us how to turn a playing card inside out.

At 18:30-19:00 GMT, Ash Frankland (, ) showed us some superflips on his Rubik’s cube.

At 19:00-19:30 GMT, Rob Eastaway (, , ) showed us a trick using (nearly perfect) riffle shuffles.

At 19:30 GMT, Katie Steckles (, , ) , Zoe Griffiths (, ) , Samuel Hansen (, ) , Ben Sparks (, ) and Matthew Scroggs (, ) joined the stream to take us through the last 90 minutes…

At 19:30-20:00 GMT, Simon Singh (, ) showed us a physics trick. Simon runs Parallel Maths () , a website full of maths resources for mathematicians aged 10 to 16.

At 20:00-20:30 GMT, Eugenia Cheng (, ) showed us how to find a hexagon in a cube, and cut a Battenburg. Eugenia’s newest book X+Y: A Mathematician’s Manifesto for Rethinking Gender and her first children’s book Molly and the Mathematical Mystery are both out now!

At 20:30-21:00 GMT, Hannah Fry (, ) joined us for a chat.

At 21:01 GMT, we went to sleep.

At around 20:45 GMT on Friday 13 November, we showed off some highlights of the 24 Hour Maths Magic Show on Mark Watson’s Watsonathon Encore.