Final answer:
The statement regarding the requirement for written and electronic formats of quantities to be both textual and numerical for written, and only numerical for electronic, is false. The format depends on the context and specific guidelines.
Step-by-step explanation:
It is not always necessary for written communications to include both textual and numerical formats of a quantity, nor for electronic communications to require only numerical formats. This depends on the context and the standards set by a particular field or discipline. For instance, in a scientific paper, it might be required to spell out numbers under ten and use numerals for numbers ten and above, yet for data entry in an electronic database, only numerical values might be required.
Considering this, the statement that written needs both textual and numerical formats of the quantity and electronic just needs numerical is false. The appropriate format for a given situation should adhere to the specific guidelines or best practices relevant to that context.