A benchmark is a number used to estimate something. One number or multiple numbers can be used as benchmarks in a mathematical equation.
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You just used the word "benchmark" in that sentence..O.o
Benchmark
No, four sevenths is not a benchmark fraction beacause benchmark fractions are used to estimate and they are easy to picture in your mind. 4 out of seven is not a very good estimate for something and it is not easy to picture in your head. Right?
the instruments in mathematics
benchmark fractions mean