Our old women calculators from school, institute or university still have a lot to say in our daily lives; and thanks to them we can surprise our friends and family with all kinds of games with the calculator, each one more ingenious. Now we want to offer you the definitive mathematical and calculation tricks, 8 ways to leave locals and strangers speechless with clever number puzzles to which we can resort to make the encounters with our loved ones more enjoyable. In addition, we offer you a small extra trick on the calculator iPhone, something that you probably don't know despite being a user iOS. Next, the best math tricks with a calculator.
The best math tricks with a calculator
The mystery of the number 73
- Write the number 73 on a piece of paper; without showing it to anyone, fold it and give it to someone.
- Ask the person to think of a four-digit number and enter it twice in a row into the calculator (for example, 12341234).
- Tell him to divide the number by 137.
- Now tell him he can divide the result by its original four-digit number; ask him to check the folded paper (73).
- The number 73 will appear on both the calculator and the paper.
Cycle 421
- Choose a number and enter it into the calculator.
- If it is even, divide it by 2, if it is odd, multiply it by 3 and add 1.
- Repeat the process over and over with different numbers.
- The result will always be 4, 2 or 1, whether using even or odd numbers.
math magic trick
This time we are going to play with the number 37037:
- Multiply the number 37037 by a multiple number from 3 to 27.
- The result will always show figures with six equal digits (for example, 111111 if we multiply the original number by 3).
Prediction of 10
Follow the following steps to surprise your friends with predictions with the number 10 as a result:
- Tell someone to tell you any number.
- Add 5.
- Subtract 2.
- Add 6.
- Subtract the original number.
- Add 1.
- The result is always… 10!
Guess the birthday
Now you can guess your friends' birthdays (if you don't already know) through a clever mathematical trick with your calculator; Give the calculator to the person you want to surprise and tell them to follow the following steps:
- Enter the number 7.
- Multiply it by the birth month number (for example, March, 3).
- Subtract 1.
- Multiply the result by 13.
- Add the number of the day of your birth (numerical calendar day).
- Add 3.
- Multiply the result by 11.
- Subtract the month of your birth.
- Subtract the day of your birth.
- Divide the result by 10.
- Add 11.
- And finally, divide the result by 100.
Thus, a figure will appear on the calculator screen that will correspond to the birthday of the person we want to surprise; Thus, if you were born on March 2, the number 3.02 will appear, or what is the same, 3 (March), 02 (day of the month).
Predicts bad luck
- Ask someone to enter a three-digit number twice into a calculator without you knowing (for example, 123123).
- Tell him that this number is divisible by 11; ask him to perform the operation.
- Now tell him that said number is also divisible by 13; ask him to perform the operation again.
- Tell him to divide the result by the original three-digit number.
- Tell him that the result is 7.
- If you want to predict bad luck, ask him to divide the number from step three by 7.
- The result will be 13, that is, the unlucky number.
Infinite loop
- Ask someone to choose a number between 1 and 9.
- Ask the person who chose the number to multiply it by 9 and the result by 12345679 (omitting the 8 from the sequence) with the calculator.
- Ask the person who did the calculation with the calculator to tell you the result.
- Tell him the number you originally selected.
- The result will always show the original number repeated in sequence of XXXXXXXXXX.
The mysterious cycle 6174
Now we are going to try our luck with the digit 6174, something that will surprise everyone and that really does not present a clear pattern. To play!
- Enter a four-digit number (not a multiple of 1111) into the calculator.
- First enter them in ascending order.
- Then do the same downwards.
- Subtract the small number from the large number.
- Repeat steps 2, 3 and 4 with the different results.
- It will always result in 6174!
Extra trick: Delete digits on the iPhone calculator!
The calculator iPhone it does not allow delete digits entered in calculator independently through the touch keys on the screen; If we make a mistake in an operation, we must delete all the numbers and try again. That was until now! And a user discovered (and shared on networks, going viral) yes we touch or slide our finger on the numerical screen iPhone calculator app deletes the last number entered, something that does not appear in the official iPhone instructions. A very useful trick that many iOS users they don't know.
