All I know is, fewer and fewer young cashiers at grocery and drug stores and at restaurants can do simple math. If they have to do something that isn't simply running a bar code over a scanner, they're lost.
I've seen this phenomenon a few times, and it never fails to floor me. To give the most recent example, a couple of weeks ago I used a raincheck for organic chickens. It allowed me to buy up to 7 pounds of chicken at $1.99 a pound. I picked up two chickens, each approximately 3.5 pounds. The very young cashier was utterly flummoxed because she could not simply run the chickens over a scanner.
I'd already done the math in my head. It was 6.98 pounds of chicken. $1.99 a pound. So, $13.89. I understand not everyone is adept at mental math, but anyone should instantly see that we're talking approximately $14, right? About 7 pounds at about $2 a pound? And any adult could do the exact calculation with a pencil and paper, much less a calculator, right?
I didn't quite learn "the value of mental approximation" in high school (where I think it really should be, or maybe even earlier), nor formally in engineering college, but it's just a small extrapolation from knowing orders of magnitude and scientific notation.I'm not sure how or where I learned it, but I've found it to be valuable.
For well over 10 years Subway has had it's "Fresh Value Meal" (now higher priced and officially the "Daily Special" which was what everyone called it before anyway) priced at $3.99, and I've been there a lot. If I ever want to hire someone, I've seen lots of people-skills I want and don't want, as well as general work (sandwich-making), arithmetic and register-operating skills. There seems to be a positive correlation in all three - someone good at one is usually good at the others as well.
One new guy... the cost with tax was $4.27. Not having four ones, I have him a five and 27 cents. He GOT OUT A CALCULATOR, pushed buttons for at least 30 seconds, then finally punched up the register (an electronic touch-display which surely also calculates exact change from amount tendered), and finally gave me the dollar in change. I saw him again within a week, but never after that.
Then there was this other new guy (why is it guys, when it's women who "aren't supposed to be good at that math stuff" - oh, but this one isn't even about the math), he made me the sandwich, I think maybe he was full of self-confidence, but anyway, the same scenario, I gave him $5.27 and he immediately gave my change back saying "It's FOUR twenty seven" and gave me change for the five. I was tempted to say something, but I didn't. Interestingly, another employee who'd been there for months (and probably in a supervisor role) saw the whole thing, and probably said something after I left. As surly as the new employee was to me, I could imagine him saying something back to the supervisor even after being told "Hey, its faster to just give back a dollar bill for the change." I never saw him again either.
Wrong. The cashier didn't want to take my mental math (understandable, I guess). None of the cashiers near her knew what to do, either, so she rang for a manager. The manager (also very young), pulled out her phone, used the calculator function, and came up with $6 something for both chickens (not each -- for both).
I protested that this was obviously wrong, and showed them my calculations on a paper bag. Finally, they told me just to take the chickens at $6 and (essentially) shut up and go on with my day. Since the people behind me were getting annoyed, I complied.
I was a cashier when I was a young'n, and damn it, pretty much everyone I worked with could do simple math calculations. WTF happened? Are they not teaching simple math in school anymore?
I learned to do it and I've never been a cashier.
Not knowing what to do when confronted with an item that can't be scanned sounds like a failure of training rather than a failure of math skills, but that's just me...
Then again as a math tutor it seemed to me that a significant number of your people are scared of numbers. I wonder who's scaring them?
Maybe it's the parents who would be lost without calculators? In the early 1970s four-function electronic handheld calculators were a new thing that
cost over $100, but went down to "easily affordable" in just a few years. I suspect arithmetic skills have been looked upon as a crude "backup system" since then.