- Take a 2-digit number beginning with 5.
- Square the first digit.
- Add this number to the second number to find the first part of the answer.
- Square the second digit: this is the last part of the answer.

#### Example:

- If the number is
**58**, multiply 5 × 5 = 25 (square the first digit). - 25 + 8 = 33 (25 plus second digit).
- The first part of the answer is 33 3 3 _ _
- 8 × 8 = 64 (square second digit).
- The last part of the answer is 64 _ _ 6 4
- So
**58 × 58 = 3364**.

** See the pattern?**

- For 53 × 53, multiply 5 × 5 = 25 (square the first digit).
- 25 + 3 = 28 (25 plus second digit).
- The first part of the answer is 28 2 8 _ _
- 3 × 3 = 9 (square second digit).
- The last part of the answer is 09 _ _ 0 9
- So
**53 × 53 = 2809**.

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