Are they also suing the people who made the floor they are walking on, as I assume they are squeaking on certain surfaces.
The Trachtenberg book is in the public domain, you can read the whole text of it here: The Trachtenberg Speed System Of Basic Mathematics : Jakob Trachtenberg : Free Download, Borrow, and Streaming : Internet Archive I've had a quick skim and decided to stick to my calculator!
There are things you are better at than me, and vice versa. Humanity has only reached this advanced stage by combining the skills and strengths of both men and women.
I did the last O Level Maths exams before calculators were allowed, so I had the log tables too. But long ago chucked out!
The first Chinese take away in town used an abacus, alternated between customer bills and maths homework for the youngsters.
One of the problems with calculators is that in everyday life you seldom need answers with 9 digits in them. 3 or 4 is generally sufficient. One of out better maths teachers taught us how to estimate an answer, before doing the calculation so you could sense check an answer. Being out by a factor of 10 is a very common error even with calculators.
Not true. My mother learnt to touch type in the late 60s and I took the opportunity to do the same. What was amusing though were the looks from women I worked with (a) that I could type at all, and (b) that I could touch type and hold a conversation at the same time. One of my father's duties when he was in the RAF in the 1950s was to teach typing.
I can remember doing maths using a log book, but I'd struggle now. I assume log books are now obsolete anyway.
If they are they shouldn't be. Being able to do calculations using manual methods always provides a safety net for when technology fails. P.S. I wouldn't be able to use log tables now either, but it is about 60 years since I had to.
When I first started work I was told you could work out all kinds of stuff on a roofing square, not just roofing cuts, nobody ever showed me how though. https://www.amazon.co.uk/Faithfull-...3226351967-B07WRL838W-&hvexpln=0&gad_source=1
Interesting experiment on TV a few years ago. School kids were given the age old dreaded maths problem abut the length of train, speed of train and length of station. They were given a pencil and paper they were unable to solve the question. Then they were given a calculator and they gave the correct answer in minutes.
