this post was submitted on 21 Apr 2024
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Idk, if you want to test people on how they understand formulae and order of operations without letting them just punch it into a calculator. The actual math isn't hard, but if you don't get substituting values into an equation then it's not trivial
Just let π be 3 ...
Or have them learn how to use a calculator at the same time.
Your life is easier and better if you can do this kind of simple math in your head.
Oh don't you try to sell me on the "you won't always have a calculator in your pocket" thing. I have fucking Excel in my pocket.
It's not just about haveing a calculator, it's also that it's faster and more convenient if you can do simple sums like this in your head. It also means you can sanity check the numbers your calculator gives you to make sure you didn't make a mistake entering the sum.
To your point below about products having their unit cost displayed, more than once I've seen that just be wrong, so I wouldn't rely on it. Make sure you can check it in your head.
Who really wants to use Excel to figure out if the 24-pack of Coca-Cola or the 3 12 packs is a better deal?
I don't need to, there's a legal requirement to print prices per liter or kg on every price tag here.
Does this requirement exist for toilet paper? Because I don't know what the hell is considered a better deal based on all the marketing.
Sadly, no. Paper towels and toilet paper are evil. Different sizes rolls with different amounts of sheets with different layers with different prices.
But if you want to buy only half a kg, you don't know how much it costs (if you dont know basic maths)- because it only lists the price for a full kg. Do you start pulling out your Excel for that?
Every offer lists how much per kg that offer is. So I do not need any calculations to see which offer is cheaper at all. Why would the price per kilo become useless of I only buy half a Kilo?
Because one is on sale, and they didn't update the sale price. Or, alternatively, because you don't want to be an idiot that can't do basic math.
You don't know how much you need to pay for it if you only know the price of 1kg but you buy half a kilo.
Erm... How the frick do you think our price tags look like?
https://www.derwesten.de/wp-content/uploads/sites/8/2022/06/2013-12-21-Rewe-cut.jpg?w=1200
Rewe also sells products by weight (mainly unpackaged fruits and vegetables).
...do you not understand how basic math works?
I do, actually. My whole point was that you need basic maths in your everyday life even though you have a calculator on your phone. You jumped right into the 6th comment in this thread without reading what this is about, didn't you?
Can we just fir half a second point out that the original comment was that the use of the real Pi (3.14...) is a great opportunity to teach pupils how to use a calculator for numbers like Pi.