Exact multiple of ten
40 is exactly 4 tens. Its ones digit is zero, so no ones word or hyphen is added.
40 in words: forty
40
In words
Forty
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How 40 is built
Pattern: Exact multiple of ten
40 is exactly 4 tens. Its ones digit is zero, so no ones word or hyphen is added.
40 has one non-zero place value, so its expanded form is unchanged.
Digit and place-value table
| Digit | Position | Value | Value in words |
|---|---|---|---|
| 4 | tens | 40 | forty |
| 0 | ones | 0 | not spoken |
Reading the number in groups
| Group | Digits | Reading |
|---|---|---|
| units group | 40 | forty |
Why 40 is written this way
Silent zero positions
The ones position contains zero. It preserves place value in the numeral but adds no spoken word.
Number structure
- 40 has 2 digits and 1 place-value group.
- 1 position contributes a spoken value; 1 zero position is silent.
- Its single two-digit group is 40, written “forty”.