What is the square root of 81?

Prepare for the SAE Mathematics Exam with our comprehensive study tool. Utilize flashcards and multiple choice questions with detailed explanations for each question. Get ready to succeed!

The square root of a number is a value that, when multiplied by itself, gives the original number. In this case, to find the square root of 81, you need to determine what number multiplied by itself results in 81.

Calculating, you find that 9 multiplied by 9 equals 81 (9 × 9 = 81). Therefore, the square root of 81 is 9. This confirms that option B is the correct answer, as it directly corresponds to the definition of a square root.

Other options do not satisfy the requirement of being the square root of 81. For example, 7 multiplied by itself gives 49, which is less than 81, while 10 multiplied by itself equals 100, exceeding 81. Similarly, 8 multiplied by 8 equals 64, which is also less than 81. Thus, among the options provided, only 9 accurately reflects the square root of 81.

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