Introduction:

Everyone loves a good magic trick, especially the ones that leave them in awe. One of the most popular tricks is guessing someone’s age with a seemingly psychic ability. Although it’s not real magic, with a bit of mathematical creativity and engaging presentation, you can amaze your friends and family by revealing their age. Here are three ways to perform a number trick to guess someone’s age:

1. The Classic Age Guessing Trick

Step 1: Ask the person whose age you want to guess to think of their age (keep this a secret).

Step 2: Instruct them to multiply their age by 5.

Step 3: Ask them to add 3 to the result.

Step 4: Request that they double this new number.

Step 5: Finally, tell them to reveal this final number to you.

Now comes the big reveal: subtract 6 from their final number and divide by 10. The result will be their actual age.

Example:

Age = 25

25 * 5 = 125

125 + 3 = 128

128 *2 = 256

Reveal: (256 – 6) /10 =25

2. The Birth Month Trick

Step 1: Tell your friend to choose their birth month’s number (e.g., January=1, February=2, etc.)

Step 2: Let them multiply this number by two.

Step 3: Direct them to add five.

Step 4: Request that they multiply the result by fifty.

Step 5: Instruct them to add their age.

Step 6: Lastly, ask them for the final sum.

Here’s the catch! Subtract the current year from their final sum (assuming it’s after their birthday), and the remaining two digit integer will represent their birth month and age.

Example:

Birth Month: February

Age: 25

2 * 2 = 4

4 + 5 = 9

9 * 50 = 450

450 + 25 =475

Reveal: (475 – the current year) – If the current year is 2021, the answer would be (475 -2021) = -1546.

Lastly, remove the sign and you get 1546. The person is born in February(age of 2) and is currently 25 years old.

3. The Number Guess Trick

Step 1: Secretly write down the number twenty.

Step 2: Ask your friend to think of any number between one and ten.

Step 3: Let them multiply their number by two.

Step 4: Direct them to add five to that result.

Step 5: Request that they multiply this new number by five.

Step 6: Instruct your friend to reveal the result.

Subtract your secret number (twenty) from their revealed number, and you’ll end up with a unique number. The first digit(s) will represent their original chosen number, while the remaining numbers indicate their actual age.

Example:

Friend’s chosen number:7

Age:23

7 *2=14

14+5=19

19*5=95

Reveal: (95-20)=75, meaning their chosen number was ‘7’ and they are ’23’ years old.

Conclusion:

Age guessing tricks can make for fantastic icebreakers or ways to entertain guests at social events. With these simple mathematical tricks up your sleeve, you’ll leave everyone marveling at your incredible “psychic” abilities.