Every Viral Maths Puzzle, Explained

16 maths puzzles that start fights on the internet, from easy warm-ups to the one that fooled maths professors. You get 3 seconds for each one. Keep score, then write it in the comments (be honest). Inside: 8 ÷ 2(2 + 2), 3 − 3 × 6 + 2, half of 2 + 2, ½ ÷ ½, is 0 even, is 1 prime, x² = 9, −3², the Japan puzzle 9 − 3 ÷ ⅓ + 1, +50% then −50%, the bat and ball, the gambler's fallacy, the Monty Hall three doors, why 0.1 + 0.2 isn't 0.3 on a computer, and 0.999… = 1 (three proofs). Not just the answers: why each one tricks so many people, and the true stories behind them (Monte Carlo 1913, the 1990 Monty Hall letters, a missile clock that drifted in 1991). Chapters 0:00 The challenge 0:27 3 + 3 × 3 − 3 + 3 1:04 Half of 2 + 2 1:30 3 − 3 × 6 + 2 2:11 ½ ÷ ½ 2:45 Is 0 even? 3:23 Is 1 prime? 4:13 x² = 9 4:51 −3² 5:29 The Japan puzzle 6:14 8 ÷ 2(2 + 2) 7:10 Up 50%, down 50% 7:54 The bat and the ball 8:42 Five heads in a row 9:20 The three doors 10:18 0.1 + 0.2 11:18 0.999… = 1 12:13 Your score Want to never lose a BIDMAS argument again? Full lesson + free worksheet:    • Order of Operations (BIDMAS) Explained Sim...   Every ___, Explained: one big topic, every piece of it, explained simply. Science myths and history myths are next. #maths #mathpuzzle #brainteaser