Return the most common value in a data set

=MODE.SNGL(number1, [number2], ...)

Round a number to a specified number of digits

=ROUND(number, num_digits)

Lookup values by row in a vertical table or range

=VLOOKUP (lookup_value, table_array, col_index_num, [range_lookup])

Search one row or one column (or an array) for a value

(Vector form) =LOOKUP (lookup_value, lookup_vector, [result_vector])

(Array form) =LOOKUP(lookup_value, array)

Extract characters from within a text string.

MID(text, start_num, num_chars), MIDB(text, start_num, num_bytes)

Sum (add) values in a range that meet multiple specific criteria.

SUMIFS(sum_range, criteria_range1, criteria1, [criteria_range2, criteria2], ...)

Return the logical value TRUE if the cell contains any text.

=ISTEXT(value)

Repeat a specific text string by a number of instances.

REPT(text, number_times)

Calculate the average of numbers in a range that meet specific criteria.

AVERAGEIF(range, criteria, [average_range])

Evaluate and return the contents of a reference specified by a text string

=INDIRECT(ref_text, [a1])

Return the smallest value in a range of values

MIN(number1, [number2], ...)

Return the rank of a number in a data set

=RANK.AVG(number,ref,[order])

Return the logical value TRUE if a cell is blank or empty

=ISBLANK(value)

Round a number down to the next multiple

=FLOOR(number, significance)

Return a custom result when a formula generates a #N/A error

=IFNA(value, value_if_na)

Convert text into lowercase, uppercase or capitalize the first letter in a string.

LOWER(text), UPPER(text), PROPER(text)