Square roots 1 to 30
Square roots 1 to 30: the square root of every whole number from 1 to 30, on one page.
Square roots 1 to 30
| n | n² | √n (3 d.p.) |
|---|---|---|
| 1 | 1 | 1.000 |
| 2 | 4 | 1.414 |
| 3 | 9 | 1.732 |
| 4 | 16 | 2.000 |
| 5 | 25 | 2.236 |
| 6 | 36 | 2.449 |
| 7 | 49 | 2.646 |
| 8 | 64 | 2.828 |
| 9 | 81 | 3.000 |
| 10 | 100 | 3.162 |
| 11 | 121 | 3.317 |
| 12 | 144 | 3.464 |
| 13 | 169 | 3.606 |
| 14 | 196 | 3.742 |
| 15 | 225 | 3.873 |
| 16 | 256 | 4.000 |
| 17 | 289 | 4.123 |
| 18 | 324 | 4.243 |
| 19 | 361 | 4.359 |
| 20 | 400 | 4.472 |
| 21 | 441 | 4.583 |
| 22 | 484 | 4.690 |
| 23 | 529 | 4.796 |
| 24 | 576 | 4.899 |
| 25 | 625 | 5.000 |
| 26 | 676 | 5.099 |
| 27 | 729 | 5.196 |
| 28 | 784 | 5.292 |
| 29 | 841 | 5.385 |
| 30 | 900 | 5.477 |
How to use this table
This is the square root of every whole number from 1 to 30, the facts a child is expected to recognise on sight by the end of the year it is taught. Cover the right-hand column and test; the ones that take more than two seconds are the ones to practise.
🧮 Calculator
The answer appears here, with the working in words.
✏️ Five questions, answers hidden
1. Give the value for 4.
Answer: 2.000
2. Give the value for 30.
Answer: 5.477
3. Which value is easiest to get wrong?
Answer: the one you had to look up
4. Cover the answers and test ten lines.
Answer: self-check
5. Write the table from memory tomorrow.
Answer: self-check
📚 The class this belongs to
Square roots are taught in Grade 8 in the US (Common Core 8.EE.2), Year 7 and 8 in the UK, Class 8 in CBSE (NCERT Class 8, Squares and Square Roots) and Year 8 in Australia.
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