Hyphenated tens-and-ones number
31 separates as 30 + 1. English joins “thirty” and “one” with a hyphen to form “thirty-one”.
31 in words: thirty-one
31
In words
Thirty-one
Check another number
How 31 is built
Pattern: Hyphenated tens-and-ones number
31 separates as 30 + 1. English joins “thirty” and “one” with a hyphen to form “thirty-one”.
Digit and place-value table
| Digit | Position | Value | Value in words |
|---|---|---|---|
| 3 | tens | 30 | thirty |
| 1 | ones | 1 | one |
Reading the number in groups
| Group | Digits | Reading |
|---|---|---|
| units group | 31 | thirty-one |
Why 31 is written this way
Hyphenation
The spelling contains one hyphen. Each hyphen joins a tens word to a non-zero ones word inside the same two-digit group.
Number structure
- 31 has 2 digits and 1 place-value group.
- Every digit position contributes a spoken value.
- Its single two-digit group is 31, written “thirty-one”.