How do I work out square roots without a calculator?

Square roots ofxy^2* 4th roots of 16x^4/x^3y^2

Square roots and Cube roots can be rational or irrational. The square root of a rational square (√7...

Square roots and Cube roots can be rational or irrational. The square root of a blank (√7 = 2.6457....

Square roots and Cube roots can be rational or irrational. The square root of a __________ square is...

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