it depends on what surd you have. Take root 72 for example, to simplify this, divide by a factor of 72, in this case 8, so that you are left with root 8 times by root 9. The root 9 can be simplified to just 3, and you will be left with 3 root 8 as your simplified answer
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A surd is a square root which cannot be reduced to a whole number: however you need to be able to simplify them.
Surds are normally irrational numbers.
Roots that are irrational are called surds. There are irrational numbers that are not surds since they are not roots of any equation. For example, Pi. Rational roots, such as square root of 4, are not surds.
Irrational number are NOT called surds. For example, pi is irrational but it is not a surd.Surds are a very small subset of irrational numbers.
surds:- if this is for the Mail on Sunday GK crossword YES IT IS