When print marketers are expected to write figures and amounts, they may spell them out (for example, "twelve" or "five percent") rather than using numerals ("12," "5 percent "). Using numerals is more accurate but less readable. Writing out the figure preserves its exactness regardless of whether a viewer/reader has access to a calculator or not.
In email communications, subjects often include large figures or percentages. When writing about these topics, it's acceptable to spell out the text even if your recipient has HTML viewable content displayed instead of plain text.
A fundamental guideline for writing numbers is that little numbers from one to ten (or one to nine, depending on the style guide) should be spelt explicitly. Larger numbers (those more than 10) are written as numerals. Numbers below ten may be spelled out only if this makes reading the text easier for some reason. For example, if there are a lot of numbers in a sentence and they include small amounts (such as coins), then it might be helpful to spell out the few smaller numbers.
In general, if you come across numbers in texts you're reading, try not to worry about spelling them out. The author or editor of the text probably found a way of writing them that was easiest to understand.
There are times when it's necessary to spell out numbers, though. If you're writing something where these details matter, such as a letter or report, then it's important to get them right. In these cases, it's best to look up the correct spelling for each word. This will make your text clearer and easier to read.
For example, suppose you're writing about figures related to money. When you mention $10,000, it would be easy to assume that this number is spelled with an "i" instead of an "e". But this isn't true - the word "million" has two million written as one thousand thousand.
Making Small and Big Numbers A fundamental guideline for writing numbers is that little numbers from one to ten (or one to nine, depending on the style guide) should be spelt explicitly. Thus 12 March 32 would be spelled out.
In English text, numbers are usually spelled out unless they are very small or very large. When writing numbers by hand, it is important to use appropriate units for each digit; for example, there should be at least an inch between any two numbers (1234 and 5632 are too close).
When typing numbers, it is only necessary to type the number itself without any additional punctuation or symbols. The computer will add the other numbers used in the text when it creates its own internal version for words like "one", "two", "three", and so on. These labels are called "symbols" because they represent a concept that has been defined by humans - the number 1.
Symbols for larger numbers are found in mathematical notation. For example, here is the symbol for 100: $100$. There are several ways to write this number in plain English, for example "one hundred". But in mathematics, we use symbols because they provide a clear and concise way of expressing large numbers.
In writing, numbers, dates, and times are counted as words. Number symbols are not counted. For example, 55% is a single integer (the symbol " percent " is not counted as a word). If you write "55 percent," however, it counts as one word and one figure. Words that show how many of something there is include: amount, count, number, few, some, all.
The benefits of simply writing numbers are self-evident. There is just one number that has to be put or altered. It also saves space and makes a document appear less "legal." Furthermore, putting down the number in words as well as digits reduces the likelihood of making a mistake. Finally, this practice provides some protection against fraud; if someone tries to pass off another person's work as their own, they are more likely to make a mistake when copying large quantities of text.
When writing out numbers it is important to follow certain conventions to ensure accuracy. Numbers should be written in full, with no abbreviations. Abbreviations are often used in business communications but would look odd in a legal document. Words such as "th" and "nd" should not be used after single-digit numbers. This is because there are two ways to write these numbers: with or without a leading zero. Using words such as "three" or "ninety" makes it easier to read and understand later on if you need to refer to those numbers again.
Numbers are usually placed in alphabetical order. This makes sense since people reading the document will want to know how much each person is being paid without having to flip back and forth between pages. If one number were to jump around depending on where it was in the document it might confuse readers.