NumberKS3 / GCSE

Square roots

Evaluate the square root of a perfect square.

  • A square root reverses squaring.
  • The square-root symbol gives the non-negative root.
  • Check by squaring the answer.

Example 1

Evaluate.

A square-root symbol means the non-negative square root.

Example 2

Evaluate.

A square-root symbol means the non-negative square root.

Remember
Check by squaring the answer.

Your turn

Question 1

Evaluate.

Check answer

A square-root symbol means the non-negative square root.

Question 2

Evaluate.

Check answer

A square-root symbol means the non-negative square root.

Question 3

Evaluate.

Check answer

A square-root symbol means the non-negative square root.

Question 4

Evaluate.

Check answer

A square-root symbol means the non-negative square root.

Question 5

Evaluate.

Check answer

A square-root symbol means the non-negative square root.

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