for using abbreviations: When using an ..
Numerals should be used for all larger numbers although the context might determine the precise usage. In technical writing such numbers should always be written using numerals. If the number is less precise, it may be possible to write the number in words.
10 Tips for Using Abbreviations Correctly - ThoughtCo
Here are some of the most common proofreader's marks I find myself using in papers. Since I try to save time grading by using abbreviations and standard symbols, I have listed them by the abbreviation I use, then by the meaning of the abbreviation or symbol. Finally, I have provided a brief explanation for each term. You should consult a grammar handbook to find out how to correct these problems in your writing if you are unsure what you need to do. The Little Brown Handbook is standard in MUW composition classes, so hopefully you still have yours. Most of the symbols I use are based on the ones listed in TLBH, though I have added a few abbreviations for common problems students have with their arguments, as opposed to purely grammatical problems.
There are a few common trends in abbreviating that you should follow when using APA, though there are always exceptions to these rules. When abbreviating a term, use the full term the first time you use it, followed immediately by the abbreviation in parentheses.
Using abbreviations in essays - Forever Living Aloe
When using numbers in essays and reports, it is important to decide whether to write the number out in full (two hundred thousand four hundred and six) or to use numerals (200,406).
Using Abbreviations To Write Notes Quickly
The key difference between acronyms and initialisms is that one creates a new word and one is simply a series of letters that are read separately. Both of these types of abbreviations are more acceptable in formal and professional writing. When using ones that are very common, such as U.S. or AIDS, it is not necessary to provide the full, spelled-out version of the abbreviation. However, for more obscure types of these abbreviations or those that are not common knowledge, it is best to first use the full version with the shortened form in parentheses immediately following. After this initial use, it is okay to switch to the abbreviation periodically. In fact, this helps make any piece a bit more readable by providing alternative phrasing. Consider the following: