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You might have been helped to think which is larger, a number that's two big chunks less than its denominator, or one that is two small chunks less than its denominator?On 2013, Dec 16, , at 15:23, Robert Cohen <Robert.Cohen@po-box.esu.edu> wrote:
We have found a very strong correlation between students passing this course with a C or better and our own survey, which is based partly on Jerome Epstein's "Basic Skills Diagnostic Test" (BSDT) and focuses a great deal on proportions and the meaning of algebraic letters (variable and unit abbreviations) vs. numbers. The key is to ask as simple a question as possible that still reveals the weakness. For example, without the help of a calculator, which is bigger: 25/27 or 15/17?
That’s hard for me. I had to think: 2/17 is larger than 2/27. Therefore, 15/17 is further from one than 25/27.
Does everyone else just know it automatically? Or is there another method?
bc fails in a timed test.