Questions tagged [calculations]

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19
votes
5answers
417 views

Questions with “round” answers only?

Textbook writers are blessed with only solving problems with neat answers. Numerical coefficients are small integers, many terms cancel, polynomials split into simple factors, angles have ...
14
votes
5answers
338 views

Amount of concrete calculations on board?

Imagine that you are teaching a high school class in the last years of high school, an undergraduate class in university, or you are a tutor of a small group at university. Should one provide ...
11
votes
8answers
8k views

Proof of why BODMAS (or BIDMAS) works?

In my first full-time teaching post, it is very likely that I'll need to be teaching a small amount of GCSE Mathematics to students retaking it. One thing that has been bugging me is that I can't seem ...
10
votes
6answers
621 views

How much detail should you show in algebra steps while teaching?

How much detail should you include when providing example solutions for students that involve algebra? I realize that this will of course depend on the level that the students are at. So I guess my ...
8
votes
2answers
255 views

Precision in student work

At the end of the school year, I gave my students a problem set related to the law of sines where many students engaged in approximation at various points. I noted two types of precision issues in ...
3
votes
1answer
539 views

Determining the first digit of the Quotient using hand long division efficiently?

For instance in the following problem: _____ 48)4368 To determine an initial 9 for the first number in the Quotient, you ...
1
vote
1answer
88 views

Student-friendly / efficient approach to computing Taylor coefficients of infinite binomial series expansions?

I’m working on a section of a course covering Taylor expansions, and have found that, although there is great notation for simplifying the formula for the coefficients of a general infinite binomial ...
0
votes
1answer
78 views

How to explain inverse modulo? [closed]

Do you know a (simple) inverse modulo calculator somewhere on the Internet? How to explain simply inverse modulo? (when the concept of modulo is already a bit known) How to explain someone how to ...