There are many number tricks that can be done using mathematical calculations. You can give certain orders and calculations to someone, then guess their age. To others, it may seem like you are doing magic. In fact, all you need to know is the instructions to be given. This math trick always works to reveal a person's age. In addition to guessing age, you can also give certain commands to guess the month and date of someone's birth. In the future, you can use this trick to guess the age of a stranger.
Step
Method 1 of 3: Guessing Someone's Age Using Certain Numbers
Step 1. Ask a friend to choose a number between two and ten
To make the game more interesting, you can ask him, for example, how many times he buys ice cream or goes out to a restaurant in one week, or something like that. Once he knows the number, ask him to name the number.
Let's say your friend chooses the number 6. This number will be used as an example in this method
Step 2. Multiply the selected number by two
You can do the calculations yourself (using your hands, for example) or have your friend use a calculator to complete the trick. Explain to him that he must press the equals (=) button after each hint you give.
For example: 6 x 2 = 12
Step 3. Add five to the product
For example: 12 + 5 = 17
Step 4. Multiply the sum by 50
For example, 17 x 50 = 850
Step 5. Ask your friend if his birthday has passed this year
If his birthday has passed, ask him to add up the previous product by 1767. If his birthday hasn't arrived yet, ask him to add 1766 on the multiplication result.
- First example: (for birthdays that have passed): 850 + 1767 = 2617.
- Second example: (for birthdays that have not yet arrived): 850 + 1766 = 2616.
- Keep in mind that these numbers are for 2017. If you want to do this trick next year, you need to use the numbers 1768 and 1767 (in 2018), 1769 and 1768 (in 2019), and so on.
Step 6. Subtract the sum from the year of birth
- First example: 2617 – 1981 (friend's birthday) = 636
- Second example: 2616 – 1981 (friend's birthday) = 635
Step 7. Pay attention to the final result of the subtraction
The first digit in the hundreds position is the number your friend chooses for the first time. The next two numbers (tens and ones) are your friend's age.
- Example 1: The result of the subtraction made is 636. The number 6 is the initial number chosen, while 36 is the age of your friend.
- Example 2: The result of the subtraction made is 635. The number 6 is the first number chosen, and 35 is the age of your friend.
Method 2 of 3: Using a Calculator to Find Someone's Age
Step 1. Ask someone to multiply the first number of their age by five
For this method, let's say your co-star is 35 years old. He can use a calculator or paper to follow this trick. Make sure you tell him to press the equals key (=) after each command you give.
For example: 5 x 3 (first number of age of the opponent) = 15
Step 2. Tell him to add the product by three
For example: 15 + 3 = 18
Step 3. Order your opponent to double the sum
For example: 18 x 2 = 36
Step 4. Ask him to add the second number of his age to the multiplication
For example: 36 + 5 = 41
Step 5. Tell him to reduce the sum by six'
The answer to the subtraction is the current age of your opponent.
For example: 41 – 6 = 35
Method 3 of 3: Using a Calculator to Guess a Person's Month and Date of Birth
Step 1. Enter the number seven
After that, multiply seven by birth month opponent. For this method, let's say your co-star's birthday is May 28, 1981.
For example: 7 x 5 (birth month May) = 35
Step 2. Subtract the product from the product by one
After that, multiply the result of subtraction by
Step 13
- Subtraction example: 35 – 1 = 34
- Example of multiplication: 34 x 13 = 442.
Step 3. Add the product of the multiplication by the date of birth
For example: 442 + 28 = 470
Step 4. Add the sum by three
After that, multiply the sum by
Step 11
- For example: 470 + 3 = 473.
- Continue addition by multiplying: 473 x 11 = 5,203.
Step 5. Subtract the previous multiplication result by the month of birth
After that, subtract the date of birth again.
- For example: 5,203 - 5 (May) = 5,198.
- Continue the first subtraction with the second subtraction: 5.198 – 28 = 5,170.
Step 6. Divide the result of subtraction by
Step 10.
After that, add the result of dividing by
Step 11
- For example: 5,170 10 = 517.
- Continue with the addition: 517 + 11 = 528.
Step 7. Divide the sum by 100
The first number that comes before the comma represents the month of birth (May). Meanwhile, the number that appears after the comma (decimal) represents the date of birth (28).
