A bench mark fraction is a fraction that its denominator can be turned into 10 or 100, can simplify and i forgot the last reason. Hope this helps! :)
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Negative half.
the answer is 4.3
You compare it to some easy to recognize (benchmark) fractions, like 1/2, or 1/4. Here's a nice YouTube video on the subject in the related links below.
sixths
B. M. stands for bench mark. A place of known elevation where the surveying begins. Wayne L.