Neat Number Tricks
"Guess" Anyone's Age
- Ask the person to multiply the tens digit of their age by 5.
- Next, tell them to add 3.
- Then, tell them to double their answer.
- And finally, ask the person to add the ones digit of their age to their answer.
- Have them tell you their final number.
- Subtract 6 from the value they gave you -- that's their age!!
Wacky Birthday Calculations 1
- Add 18 to your birth month
- Multiply your result by the number of cents in a quarter
- Reduce your answer by 333
- Multiply by the number of angles in an octagon
- Subtract 554
- Divide your answer in half (hint: this is not the same as dividing by 1/2)
- Add the day of your birth
- Multiply your resulting number by 5
- Increase your answer by 692
- Multiply by two tens
- Add only the last two digits of your birth year
- Subtract 32,940 to get your birthday!
Wacky Birthday Calculations 2
- Start with the number 7
- Multiply by the month of your birth
- Reduce your answer by 1
- Multiply by 13
- Increase your resulting number by the day of your birth
- Add the number of sides on a triangle
- Multiply by 11
- Subtract the month of your birth
- Subtract the day of your birth
- Divide by 10
- Add 11
- Divide by 100 to get your birthday!