Ideas Oklahoma Math (2025) - 8th grade \( \quad \) Positive and negative square roots ME5 What is the positive square root of 0.81 ? Write your answer as a decimal.

The positive square root of 0.81 is 0.9. This is because when you multiply 0.9 by itself (0.9 × 0.9), you get 0.81. It's a neat little trick to remember that every positive number has both a positive and a negative square root, but when we’re looking for the positive one, we simply stick with the positive decimal value! A fun fact: Square roots can also be visualized! If you imagine a square whose area is 0.81 square units, each side of that square must be 0.9 units long. This visual image can help solidify the concept of square roots in a tangible way!