A third dice trick with Ben Sparks – see the trilogy of tricks at: https://bit.ly/Dice_Trilogy More links & stuff in full description below ↓↓↓ Ben Sparks: …

# Math

This problem is adapted from an Oxford University admissions question. They say if you can solve this in your head, you are a genius 😉 Alex Bellos’s column on …

What sorcery is this? The slide method of multiplication! #shorts A longer video: https://youtu.be/iZG25uBwU7M Article …

Featuring Matt Henderson… Check out Brilliant (get 20% off their premium service): https://brilliant.org/numberphile (sponsor) More links & stuff in full description …

Three squares are placed in a row. Connect the bottom left corner of each square to the top right corner of the third square, forming angles with measures a, b, …

I had fun with this puzzle! #shorts Seen on Twitter https://twitter.com/ssaraceno19/status/1062504179376115712.

Johnny Ball is back talking about Hippocrates, Lunes, and a Fancy Q. More links & stuff in full description below ↓↓↓ Johnny Ball’s website: …

I had fun solving this one! Special thanks this month to: Mike Robertson, Michael Anvari, Robert Zarnke, Fiona Harper, Kyle, Jamal Jackson. Thanks to all …

Three circles are wedged between two rays that are 60 degrees apart. If the first circle has a radius equal to 1, what is the radius of the third circle? New Scientist …

Matt Henderson is making lightning in mazes. Check out https://www.kiwico.com/Numberphile and get 50% off your first month of any subscription. More links …

This is one of the hardest algebra problems I’ve seen on Twitter. Problem from Twitter https://twitter.com/chillsparkle/status/1405452712859226112 I didn’t …

Featuring Ben Sparks… Check out Brilliant (get 20% off their premium service): https://brilliant.org/numberphile (sponsor) More links & stuff in full description …

What is the area of the red stripes? 0:00 problem 1:00 similar triangles 3:00 solution References Similar triangles area (Math StackExchange) …

This was asked to students in 1801, but it is still a challenging and fun problem to solve to this day! Source See page 5, problem 24 …

Featuring Marcus du Sautoy from Oxford University. Check his latest book “Thinking Better: The Art of the Shortcut” Links & stuff in full description below …

University entrance exams and job interviews have asked questions similar to this problem. What is the area of the rectangle? What is the minimum area of the …

Featuring Tom Crawford and an Oxford Admissions Question… Check out Brilliant (get 20% off their premium service): https://brilliant.org/numberphile (sponsor) …

What is 2 + 2×4 = ? Many people are having arguments about this problem. It’s time for the order of operations to save the day, again! #shorts BuzzFeed Math …

A version of this problem was asked in India. Can you figure it out? Subscribe: https://www.youtube.com/user/MindYourDecisions?sub_confirmation=1 Send me …

Matt Henderson shows us a few animations he created to depict chaos. More links & stuff in full description below ↓↓↓ More videos with Matt soon… Follow his …

Thanks to Devesh from India for the suggestion! A version of this problem was given in an Olympiad qualifying test. Socratic …

Ben Sparks with another trick – can you guess how it works before he explains it? More links & stuff in full description below ↓↓↓ This is the second of a trilogy …

If the first square has a side length equal to 1, what is the sum of all blue areas? Can you solve this fascinating problem? 0:00 Problem 1:11 Hint 3:58 Solution …

Can you solve this incredibly difficult calculus question? I had a lot of fun solving this one! Special thanks this month to: Kyle, Mike Robertson, Michael Anvari.

Can you solve this geometry brain teaser? Note: I was emailed a similar problem but I am unable to locate the original source. It seems to be in the style of Bright …

More links & stuff in full description below ↓↓↓ Johnny Ball: https://johnnyball.co.uk More Numberphile videos with Johnny Ball: http://bit.ly/Johnny_Ball …

Can you solve this interesting geometry problem? References Solution by “WAY TO GOVT JOB” on YouTube https://www.youtube.com/watch?v=oGNWdhh5qzg …

This is the first of a trilogy of dice tricks with Ben Sparks… More to come soon… Martin Gardner called this trick “Hummer’s Die Mystery” and attributed it to Bob …

Can you solve this challenging problem? Thanks to Ramesh for the suggestion! 0:00 Problem 1:18 Method 1 4:11 Method 2 (Sorry about the repost!

Send me suggestions by email (address at end of many videos). I may not reply but I do consider all ideas! If you buy from the links below I may receive a …

Video by Brady Haran and Pete McPartlan Patreon: http://www.patreon.com/numberphile Numberphile T-Shirts and Merch: …

Students in the UK faced a similar question to this one. Can you figure it out? Adapted from …