To determine perfect squares and surds.
I noticed that the surds have an odd number of decimals. (Notice the red line on the picture above). If it is a perfect square, it would have an even amount of decimals.
for example:
√0.0081 = 0.09²
There is an even amount of decimals (in this case, there are
four) which tells me that it's square root is not a surd.
SQUARE ROOT OF FRACTIONS:
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