Key Stage 3 (KS3) General Knowledge Practice Test

The square root of a number is a value that, when multiplied by itself, gives the original number. In the case of 64, the square root is 8 because 8 multiplied by 8 equals 64 (8 x 8 = 64). This means that 8 is the number that, when squared, results in 64.

Understanding the concept of square roots is fundamental in mathematics, as it allows for solving equations and understanding relationships between numbers. The correct answer, 8, is recognized as a perfect square because it is a whole number. Other numbers like 6, 7, and 9, when squared, yield different results: 6 squared is 36, 7 squared is 49, and 9 squared is 81. This distinction highlights why 8 is the accurate square root of 64.