![]() ![]() Tell your friend to add the individual digits (4 + 7 + 9 + 8 = 109) Ask them to hide it, so you can't see it. Just do the calculation at the end, and you'll have your friends scratching their head wondering how you did that.Īsk your friend to write down any number that is at least four digits long. Like the "Guess The Numbers" above, this trick requires some quick calculating on your part. You should get a two digit number - the digit in the ten's place is the number that was multiplied by 5 and the digit in the one's place is the other number chosen at the beginning. Take your friend's answer and subtract 14. (47 x 2 = 94)Īdd it to the other number that was first selected. Then tell your friend to add 7 to this result. Tell your friend to choose either of the numbers and to multiply it by 5. Just do the quick math at the end to baffle your friends with your math prowess.Īsk your friend to select two numbers, each of which is less than 10. This trick requires some work on your part. While you friend is typing numbers furiously on your iPhone, you can write down the first number three times and find the answer in a matter of seconds. Then multiply that result by 37 and hit enter/equal (22386 x 37 = 828,282) ![]() Then multiply that result by 13 and hit enter/equal (1722 x 13 = 22,386) Then multiply that result by 7 and hit enter/equal (246 x 7 = 1,722).Tell your friend to multiply this number by 3 and hit enter/equal (82 x 3 = 246).Have your friend pick any 2 digit number (82, for example).To make it realistic, hand friend the iOS calculator and grab a piece of paper and pencil for yourself. This trick will make it appear that you are the world's fastest human calculator. The Human Calculator, aka the 3-7-13-37 Trick Voila! The answer on the calculator should match the number on the paper - 73! Tell your friends to divide the result by the original four-digit number.Īstound your friend by asking him or her to unfold the paper. Inform your friend that the number is divisible by 137 and ask him or her to verify using the calculator. Tell your friend select a four-digit number and enter it twice into a calculator. Write the number 73 on a piece of paper, fold it up, and give it to an unsuspecting friend. Give it a whirl and see if it impresses a crowd.īy subscribing, you are agreeing to Engadget's Terms and Privacy Policy. This trick makes it appear that you can predict the future. Type in the first 3 digits of your phone number (not your area code) (So you would type in 759 if your number was 80) Make sure you hit enter/equal between each step. This trick works only in the US with 7-digit phone numbers. If you have any tricks up your own sleeve, please share them in the comments. Here are some cool calculator tricks you can use to find someone's phone number, guess their age and astound them with your math wizardry. The iPhone calculator is great for crunching numbers in a pinch, but you can also use it to have some fun with your friends and family.
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