How Do You Spell 31 In Words Perfectly Without Mistakes

Spelling of 31 in words

How do you spell 31 in words:
Convert 31 dollars in words (USD):
Thirty-One Dollars
31 spelling in British Pound amount (GBP):
Thirty-One Pounds
How to write 31 Canadian dollars in letters (CAD):
Thirty-One Canadian Dollars

How to write numbers in words similar to 31

Other conversions of the number 31

How to Spell 31

The number 31 is spelled as ‘thirty-one’. It is a hyphenated compound number that combines ‘thirty’ and ‘one’. The hyphen is used to join the two separate words into a single entity representing the number just after thirty.

Spelling Details and Variations

Unlike the cardinal number ‘thirty-one’, the ordinal form is spelled as ‘thirty-first’. To spell out the ordinal number, combine ‘thirty’ with ‘first’, without a hyphen. In numerical form, the ordinal is written as ’31st’.

When to Spell Out 31 and When to Use the Numeral

Generally, the rule of thumb is to spell out numbers that can be expressed in one or two words, such as thirty-one. Use numerals in scientific or technical writing, or when dealing with figures that span over two words such as percentages, dates, and large numbers. Here, ’31’ would be more appropriate.

Practical Examples in Sentences

Here are several sentences using the number 31 in various contexts:

  • The building has thirty-one floors.
  • She turns thirty-one years old today.
  • The recipe calls for 31 grams of flour.

Special Considerations

In certain contexts such as financial and technical writing, the numeral ’31’ is preferred over the word form. For instance, in financial documents, you would write $31.00 instead of ‘thirty-one dollars’, and in technical contexts, ’31 mm’ instead of ‘thirty-one millimeters’ for clarity and consistency.


Understanding how to use the number 31 effectively is important for clear communication, especially in writing. Knowing when to use the word form and when to rely on numerals will ensure that your message is both precise and professional.


Consider these exercises to familiarize yourself with the number 31:

  • Convert 31 to a Roman numeral.
  • If you divide 31 by 2, what is the remainder?
  • Write thirty-one thousand in numeral form.

Solutions to Exercises

Here are the solutions:

  • 31 in Roman numerals is XXXI.
  • When you divide 31 by 2, the remainder is 1.
  • Thirty-one thousand in numeral form is written as 31,000.

Frequently Asked Questions

Is 31 a prime number?

Yes, 31 is a prime number because it has only two distinct positive divisors: 1 and itself.

How is 31 used in time calculations?

In time calculations, 31 can refer to the number of days in some months of the year.