The square root of 0.81 is 0.9.
To understand why, let’s break it down. The square root of a number is a value that, when multiplied by itself, gives the original number. So, we are looking for a number that, when squared (multiplied by itself), results in 0.81.
If we calculate 0.9 x 0.9, we get:
0.9 × 0.9 = 0.81
Therefore, the square root of 0.81 is indeed 0.9. This concept of square roots is fundamental in mathematics, and it applies to decimal numbers in the same way it applies to whole numbers. So next time you encounter a square root, remember to think of it as finding the number that, when squared, returns to the number you started with.