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If the square of a number is 81, what is the number?

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Question: If the square of a number is 81, what is the number?

Options:

  1. 7
  2. 8
  3. 9
  4. 10

Correct Answer: 9

Solution: 

The square root of 81 is 9, since 9 * 9 = 81.

If the square of a number is 81, what is the number?

Practice Questions

Q1
If the square of a number is 81, what is the number?
  1. 7
  2. 8
  3. 9
  4. 10

Questions & Step-by-Step Solutions

If the square of a number is 81, what is the number?
  • Step 1: Understand that 'the square of a number' means multiplying the number by itself.
  • Step 2: We are given that the square of a number is 81.
  • Step 3: To find the original number, we need to find the square root of 81.
  • Step 4: The square root of 81 is the number that, when multiplied by itself, equals 81.
  • Step 5: Calculate the square root of 81. We find that 9 * 9 = 81.
  • Step 6: Therefore, the number we are looking for is 9.
  • Square and Square Root – Understanding the relationship between a number and its square, as well as how to find the square root.
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