You make a good point. You don't need much more arithmetic than being able to count to five or six (as in quarts) to change oil, or to change a tire. But . . .
When it comes to picking a wrench, it IS helpful to have in your head what it takes to know that 9/16 is larger than 1/2. In more serious work, it's also useful to know decimal equivalents, like 1/8=0.125.
In my day, the big question was whether you could use a slide rule for an exam. My school addressed that by having a qualifying exam for using a slide rule. The exam was given in class as part of the teaching of logarithms. If you passed, you could use your slide rule. If you failed, you could do your homework and be given an opportunity to take it later after school.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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