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Year 8 · Place Value
Squares, cubes and roots
A square number is a number times itself. A square root undoes it.
How to do it
- Squares: 1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144.
- Cubes: 1, 8, 27, 64, 125.
- The root asks which number was squared or cubed.
Worked example
√121 = ?
Which number times itself gives 121? 11 × 11 = 121, so the square root is 11.
Answer: 11
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Watch outLearn the square numbers to 12² = 144.
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