Fórmula genérica
=COUNTIF(rng,"
Summary
To count the number of cells that contain values less than a particular number, you can use the COUNTIF function. In the generic form of the formula (above) rng represents a range of cells that contain numbers, and X represents the threshold below which you want to count. In the example shown, G5 contains this formula:
=COUNTIF(C5:C11,"<80")
Explanation
COUNTIF counts the number of cells in the range that contain numeric values less than X and returns the result as a number.
If you want to count cells that are "less than or equal to 80", use:
=COUNTIF(C5:C11,"<=80")
If you want to use a value in another cell as part of the criteria, use the ampersand (&) character to concatenate like this:
=COUNTIF(rng,"<"&A1)
If the value in cell A1 is 100, the criteria will be "<100" after concatenation:
=COUNTIF(rng,"<100")