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A surd is an irrational number or in other words a number with recurring decimals. This simple online calculator helps you to determine whether the entered mathematical expression is a surd.
if solution of a1/n is an irrational number then a1/n is a surd
Example: √2 (square root of 2) can't be simplified further so it is a surd
Example: √4 (square root of 4) can be simplified (to 2), so it is not a surd!