The square root of 400 is:

\[
\sqrt{400} = 20
\]

Do you have any questions or would you like more details?

Here are 5 related questions to expand on this:

1. What is the square root of 625?
2. How do you calculate the square root of a non-perfect square, like 50?
3. What is the cube root of 400?
4. Can you find the square of 20?
5. How do square roots relate to exponents?

**Tip:** When dealing with square roots, if the number is a perfect square (like 400), its square root is an integer. Otherwise, it will be an irrational number.

Learn how to calculate the square root of 400, which is a perfect square. This tutorial walks you through the steps to find that the square root of 400 is 20. Suitable for students in Grades 5-6.

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