Spell out ordinal numbers (like first). Hyphenated number like twenty-first counts as one word
If a number starts a sentence, spell it out
use words when expressing rounded or approximate numbers
write all numbers the same way in a sentence
The plural of a numeral is done by adding an s
Use numerals for dates
Use numerals with currency symbols in text
numbers when they have a special purpose: Use all numerals when they are used in tables, dates, money, clock time, proportions and ratios, scores, votes, percentages, abbreviations and symbols, highway designations, and page numbers
numbers and percentages: Express percentages in figures and spell out the word "percent"
numeric values in sequence: Write one as a number and another as a word
numbers as fractions: Spell out fractions that stand alone. Use figures only to express a mixed number
rules for large numbers: Use a combination of numerals and writen numbers for large numbers like 3 million
You attitude:
empathize with the reader and think of the benefit they receive
Emphasize what the reader wants to know
Don't tell readers how they will feel or react
Don't use emotional language expressing feelings unless for universally good or bad news like promotions and death especially
Protect the reader's ego when you are correcting a reader and don't blame them
don't tell the reader what they must or have to do. don't be patronizing
Tell the reader why you are asking for something
Positive emphasis:
avoid negativetrigger words like "never", "failed", "unable to", "cannot", and "unfortunately"
State information in the positive
Justify negative information by providing a reason or linking it to reader benefit