Mental Math Saved Me From a 45% Tip скачать в хорошем качестве

Mental Math Saved Me From a 45% Tip

Why learn all these little math tricks when we can just type stuff into our calculators, right? Let me give one small illustration. This actually happened to me recently, I'm not just making it up, I promise. Check out the main channel! ‪@polymathematic‬ A few weeks ago, I got a haircut. Cost me $28. When it was time to pay, I tapped my credit card and the little screen popped up with that familiar question: Do you want to tip? Now normally, these tipping screens give you three buttons. The lowest is usually 15%, which makes you feel like a cheapskate. Nobody wants to hit the lowest button. The top one is 20%, and maybe if I’m feeling flush or it was a particularly good haircut, I’ll go for that. But more often than not, I just hit the middle one—18%—because it sounds reasonable, and I’m not exactly walking around computing percentages in my head. But then I looked at the numbers. On a $28 haircut, the tipping options were $7, $9.80, and $12.60. Now this is not really the kind of situation where you want to whip out your phone and run the numbers, but I also don’t want to just blindly punch in something totally unreasonable. Fortunately, I know a simple trick: 10% of $28 is $2.80. Double it, and you’ve got $5.60—20%. So anything between $4.20 (15%) and $5.60 (20%) is in the normal range. But none of the numbers on screen were even close. They were way higher. At the time, I ended up just punching in $5—somewhere in the right ballpark—but afterward, I started thinking about what I’d seen. $7 out of $28? That’s 25%. Each level was jumping by $2.80—another 10%. The actual tips on screen were 25%, 35%, and 45%. Now look, I don’t begrudge the hairstylist or the point-of-sale system trying to squeeze a few extra bucks. But here’s the point: I didn’t need to open my calculator. I didn’t need to check Google. I could just do some quick estimation in my head. And that was enough to notice I was being nudged toward tipping way more than I intended. Mental math isn’t about showing off. It’s about staying aware. And sometimes that awareness saves you money. #MentalMath #EverydayMath #TipSmart Watch more Math Videos: Math Minis:    • Math Mini   Math Minutes:    • Math Minutes   Number Sense:    • Number Sense (UIL / PSIA)   MATHCOUNTS:    • MATHCOUNTS   Follow Tim Ricchuiti: TikTok:   / polymathematic   Mathstodon: https://mathstodon.xyz/@polymathematic Instagram:   / polymathematicnet   Reddit:   / polymath-matic   Facebook:   / polymathematic