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How would you do this correctly without a calculator? You basically need to do a calculation like this in your head: 100*(3 - 2.33)/3 ≈ 22.33%
by olegk 17y ago
How would you do this correctly without a calculator?
You basically need to do a calculation like this in your head:
100*(3 - 2.33)/3 ≈ 22.33%
- z8000 17y agoSuch a calculation _should be_ something anyone on Earth over the age of 6 (OK I said 4th grade so 8-9) should be able to handle in their head without being handheld by a handheld [calculator].
- cdr 17y agoGee, you're really realistic. When I went out to dinner with my parents, none of the ten people over age 30 could calculate a 20% tip - much less the other way around. Most people just do not do math outside the presence of a calculator, so those skills fade.
- z8000 17y agoYes, and that is an example of what I find to be sad. Also, I did try to emphasize "_should be_" in my comment. It is not realistic, it is what I personally consider to be "better" (basic math skills over reliance on a calculator). Perhaps I'm getting ahead of myself but it seems like a slippery slope to rely on a calculator for (subjectively) simple calculations. It leads to a "oh, someone else will figure this out for me" mentality.
- NathanKP 17y agoA quick tip on how to calculate tips: Finding 10% of an amount is easy. All you have to do is move the decimal point over one position to the left. For example if you had an $80 dinner, then 10% of that is $8. Just double that amount to find the 20% tip, in this case $16. I think that with a little thought most people should be able to figure out these tricks, but you are right, most people don't bother and their skills fade.