Finding the square root is difficult to do mentally and really just comes with practice. For perfect squares (such as 9, 16, 25) you will just have to recognise the square roots (3, 4, 5). If it is not a perfect square, e.g. 26, you can find the nearest perfect square and estimate based on that (26 is just over 25, so the square root is just over 5 - it is 5.1). If you have no idea you can just wo... more

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Grace Cooper
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