10, probably. The question is not entirely clear.
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The square root of 100 is 10
sqrt(200) = sqrt(100*2) = sqrt(100)*sqrt(2) = 10*sqrt(2)
Here is an example, radical 20 plus radical 5. Now radical 20 is 2(radical 5) so we can add radical 5 and 2 radical 5 and we have 3 radical 5.
radical 3 or 6
200 = 2*100. Square root of 100 is 10. So, reduced form is 10 times the square root of 2.