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The phrase "a very rough approximate" is not correct in standard English.
The correct form would be "a very rough approximation." You can use it when describing an estimate that is not precise or exact.
Example: "The cost of the project is a very rough approximation, as we are still gathering all the necessary data."
Alternatives: "a rough estimate" or "a rough calculation."
Exact(1)
Nonetheless, we caution the user that this approach appears to be only a very rough approximate estimate of the chip error rate.
Similar(59)
But it's a very rough approximation.
It's a very rough approximation.
However, for unequally spaced data this is a very rough approximation, making this approximation undesirable.
It is a very rough word.
Still, this provides a very rough estimate.
"She says he was very crude, a very rough character".
"2010 is going to be a very rough year, not as rough as 2009, but pretty rough anyway".
It's a (very rough) working title.
I had a very rough pregnancy".
"It's been a very rough winter.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com