Return a random integer number between 2 values

=RANDBETWEEN(bottom,top)

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

SUMIF(range,criteria,[sum range])

Returns the character specified by a number

CHAR(number)

Return the logical value TRUE if the cell contains a reference.

=ISREF(value)

Return the serial number of a particular date

=DATE (year, month, day)

Round a number down to the next multiple

=FLOOR(number, significance)

Return the reverse of TRUE or FALSE statements based on testing logical conditions

=NOT(logical)

Lookup values by column in a horizontal table or range

=HLOOKUP (lookup_value, table_array, row_index_num, [range_lookup])

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

=IFNA(value, value_if_na)

Return TRUE or FALSE statements based on testing multiple logical conditions

=AND(logical1, [logical2], ...)

Find specific text and its related starting position within a text string.

FIND(find_text, within_text, [start_num])

FINDB(find_text, within_text, [start_num])

Returns a value from a list based on an index number.

=CHOOSE(index_num, value1, [value2], ...)

Return the logical value TRUE if the cell contains any value that is not text.

=ISNONTEXT(value)

Repeat a specific text string by a number of instances.

REPT(text, number_times)

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

=ISBLANK(value)