Grab a calculator (You won't be able to do this one in your head)2. Key in the first four digits of your phone number (NOT the area code-if your number is 01.. Adapted for Australian conditions, hehe (hopefully correctly) from
Step four: Have them type the first three digits of their phone number (not including the area code, or first four digits if you're from the UK) into the calculator .
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In this math trick, you get your friend to do a sequence of arithmetic steps.. Enter the number 7; Multiply by the month of your birth; Subtract 1; Multiply by 13. If you are in Europe or Australia, you probably want February 29 to look like 29.02,
In this math trick, you get your friend to do a sequence of arithmetic steps. Then you divine their birthday, or another secret number, almost magically from the answer.. Give your friend a calculator, and ask them to follow these simple steps :. Of course, if you are in Europe or Asia or Australia, you'll want the 29th February .
GS1 Check Digit Calculator can calculate the last digit of a barcode number, making sure the barcode is correctly composed. Calculate a check digit.