- Choose a 2-digit number ending in 5.
- Multiply the first digit by the next consecutive number.
- The product is the first two digits: XX _ _.
- The last part of the answer is always 25: _ _ 2 5.

#### Example:

- If the number is
**35**, 3 × 4 = 12 (first digit

times next number). 1 2 _ _ - The last part of the answer is always 25: _ _ 2 5.
- So
**35 × 35 = 1225**.

** See the pattern?**

- For 65 × 65, 6 × 7 = 42 (first digit

times next number): 4 2 _ _. - The last part of the answer is always 25: _ _ 2 5.
- So
**65 × 65 = 4225**.

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