- Fun Things to Know
December 21, 2000
Take a number, any number.
Multiply by 2. Add 8. Divide by 2. Subtract the number you started with.
Your answer is 4.
What's the trick? After you
have thought about it for awhile, check out the answer key. But don't cheat!
Did you know that if you multiply
111,111,111 X 111,111,111 that the answer is consecutive? Try it and then
check the answer key to see what happens.
Did you know that if you take
your phone number through a series of algebraic steps in an equation, that
you come out with the same phone number when you are done? Try it:
Take 60. Divide 60 by 2.
Add your telephone number digits. Subtract 25. Multiply by 3. Subtract
15. Multiply by 2. Divide by 6. The answer is your telephone number. Check
out the answer key to see this expressed in an equation.
Do you want to know a numerical
magic trick? See if you can figure out this game:
Math can be fun!!
111,111,111 X 111,111,111 =
Notice that the digits in
the answer ascend consecutively until they reach nine and then descend
consecutively from nine to one.
Let x be your telephone number.
Then set up the following equation:
2[3(60/2 + x-25) – 15]
Solve what is within the parentheses
first so that you have:
2[3(x + 5) – 15]
Then solve what is in the brackets:
2 (3x + 15 –15)
Continue to work the equation.
Everything will cancel out except x (the telephone number).
The trick to this one is that
you remember the number in the third step and divide by 2. In this example,
the third step was to add 8, so the answer will be 4. If you add 10, the
answer will be 5. Go ahead … amaze your friends!