This is a good site: http://www.grammarbook.com/numbers/numbers.asp
Numbers 1-9 are written out, numbers 10 or above are handwritten, and most importantly be consistent, if using one or the other:
ex: I bought 100 cats and two hundred dogs. Incorrect
I bought one hundred cats and two hundred dogs. Correct
The general rule in formal writing (that which you do for school or work) is yes. All numbers that appear as two or fewer words should be written out.
The most formal kind of functional writing would be formal letters. This type of letter would be used in circumstances dealing with business matters or even when writing to a stranger.
2.3 could be written as two point three, or it could be written two and three tenths. What you choose would be a matter of convenience, depending on the length of the number. What you choose might also be a matter of formal style depending on the context of the writing.
The formal definition of a rational number is: Any number that can be written as a fraction with whole numbers on top and bottom. 3/4 certainly seems to fit that description.
You should write it in full in any formal or academic writing.
In formal writing, it is incorrect to use actual digits to represent numbers 1-10. In stead, these numbers should be spelled out according to formal guidelines.
The general rule in formal writing (that which you do for school or work) is yes. All numbers that appear as two or fewer words should be written out.
Sarah Loving has written: 'Formal Writing Skills'
any written type of writing or drafting used in technical and occupational fields
what is the role of formal writing
A letter of resignation would be formal writing.
Formal English is the English written in works like essays, where it's a standardized, formal way to write it, but informal English is what I'm writing in right now, a loose, not very structured way of writing.
simple contract cane be formed as verbally or as writing whereas formal contracts can only be formed as writing.
Speaking is more formal than writing (apex)
Interjection is the part of speech rarely used in formal writing.
C. Speaking is more formal than writing. This statement is not typically true, as speaking is often more informal and conversational compared to the formal nature of written communication.
A business letter is the most formal type of functional writing.