Square root of 18
The square root of 18 is 4.242641 (rounded to 6 decimal places). In simplest radical form it is 3ā2.
Square root of 18
Pick any whole number from 1 to 10,000.
How to work it out
- 1
The square root of 18 is the number that multiplied by itself gives 18.
- 2
18 is between the perfect squares 4Ā² = 16 and 5Ā² = 25, so its square root is between 4 and 5.
- 3
Pull out the biggest square factor: 18 = 9 Ć 2, so
- 4
A calculator, or long division of digits, gives
LaTeX source of the formulas on this page
\[ \sqrt{18} = 3\sqrt{2} \approx 4.242641 \]
\[ \sqrt{18} = \sqrt{9 \times 2} = 3\sqrt{2} \]
\[ \sqrt{18} \approx 4.242641 \]Squares around 18
| Number | Squared |
|---|---|
| 3 | 9 |
| 4 | 16 |
| 5 | 25 |
| 6 | 36 |
Questions
What is the square root of 18?
The square root of 18 is 4.242641 (rounded to 6 decimal places). In simplest radical form it is 3ā2.
Is 18 a perfect square?
No. It lies between 4Ā² = 16 and 5Ā² = 25.
What is 18 squared?
18 Ć 18 = 324.
What is the square root of 18 rounded to 2 decimals?
4.24.