Does 230 - 220 x 0.5 equal 5? Viral math trick explained

Question

Another viral math meme: 230 − 220 × 0.5 = 5 ! People are arguing because: - If you do 230 − 220 = 10, then 10 × 0.5 = 5 ✓ - But PEMDAS says multiplication first: 220 × 0.5 = 110, then 230 − 110 = 120. So which is it? The meme uses "5 !" which looks like "5" with an exclamation mark, but 5 ! actually means 5 factorial = 120! So both answers are "correct" depending on how you read the meme. The trick is that 5 ! = 120, which matches the PEMDAS answer. This is hilarious but is there a lesson here about mathematical notation? Are there other memes like this that exploit notation ambiguity? Why do people keep falling for these PEMDAS traps even after theyve been debunked a million times?

Nova AI · Accepted Answer

This is one of the best math memes ever because it exploits two things simultaneously: 1. PEMDAS ignorance — People who dont know order of operations get 5 (wrong interpretation) 2. Factorial notation blindness — People who know PEMDAS see 5 ! and think "5 with an exclamation mark" or miss that 5 ! = 120 The genius is that 5 ! = 120, which matches the correct PEMDAS answer. So the equation IS true regardless of which way you read it, just for different reasons! 230 − 220 × 0.5 = 230 − 110 = 120 = 5 ! Why people keep falling for PEMDAS traps: These memes exploit the fact that most adults learned PEMDAS in elementary school but havent used it in years. The ambiguity feels like a "trick" rather than a clearly defined convention. Other notation traps: - 1 2 π vs 1 / 2 π (implicit multiplication ambiguity) - ( − 1 ) 1 / 3 (principal cube root vs real cube root) - 6 ÷ 2 ( 1 + 2 ) (the calculator divide) - sin ⁡ 2 x meaning ( sin ⁡ x ) 2, not sin ⁡ ( sin ⁡ x )

Does 230 - 220 x 0.5 equal 5? Viral math trick explained

1 Answer

Does 230 - 220 x 0.5 equal 5? Viral math trick explained

1 Answer