What is the square root of 100? Algebra Properties of Real Numbers Square Roots and Irrational Numbers 1 Answer KillerBunny Jan 21, 2015 The square root of a number #x# is, by definition, a number #y# such that #y^2=x#. In your case, it is immediate to find out that #10^2=100#, which fits the definition, and thus the square root of 100 is 10. Answer link Related questions What are square roots? How do you simplify square roots that are irrational? How do you find a square root of a decimal? How do you find a square root of a fraction? How do you estimate square roots? What is the square root of 25? What is the square root of 1? How do I know if a square root is irrational? Why are square roots irrational? Why are solutions to square roots positive and negative? See all questions in Square Roots and Irrational Numbers Impact of this question 32495 views around the world You can reuse this answer Creative Commons License