Number

Sometimes you want to impress those around you by seeming almost like a psychic. Perhaps you want to show children how much you know and can do. Guessing a thought-of number is a great trick to grab attention.

Instructions

1. Ask someone to think of three digits (specifically digits, not numbers).

2. Then ask them to multiply the first digit by $2$ and add $3$ to the result. Multiply this result by $5$.

3. Next, add the second digit to the obtained number, then multiply the result by $10$.

4. Add the third digit to the new number.

5. Ask them to say the obtained number out loud.

Pretend to ponder (but don't take too long). Meanwhile, subtract $150$ from the number spoken. The first three digits of the result are exactly those digits thought of in the beginning.