The words Squared and Square Root are opposites.
You should know that 0.3 squared = 0.09 because 0.3 x 0.3 = 0.09
We write this as 0.32 = 0.09
And so the square root of 0.09 = 0.3
We write this as √0.09 = 0.3
Example
Work out √0.49 and √0.0001
Answer
√0.49 = 0.7 because 0.72 = 0.49
√0.0001 = 0.01 because 0.012 = 0.01 x 0.01 = 0.0001