Does anyone know any number tricks?

Google "number tricks" and you'll find zillions of pages. You can even make one up yourself if you're decent with algebra. What you need to do is make up a process starting with a variable instead of a number. We'll call it X. Now, you can do all sorts of stuff to X, like squaring it, adding numbers to it, etc. So long as you have a step in there that eliminates the X then the final number will be the same no matter what you start with. Here's an example. Choose any random positive integer:

1. Square it.

2. Add the result to your original number.

3. Divide by your original number.

4. Add, oh I don't know, say 17.

5. Subtract your original number.

6. Divide by 6.

The answer is 3!

If you write out the steps you'll see that in step 5 your X is subtracted out of the equation. You can get as complex as you want, although if you want to do stuff where you add the numbers together or something similiar sometimes you need to use both an X and a Y (or as many variables as you need).

Here's a cool mathematical magic trick. Write down a three-digit number whose digits are decreasing. Then reverse the digits to create a new number, and subtract this number from the original number. With the resulting number, add it to the reverse of itself. The number you will get is 1089!

For example, if you start with 532 (three digits, decreasing order), then the reverse is 235. Subtract 532-235 to get 297. Now add 297 and its reverse 792, and you will get 1089!

It works in view that you begin off with one quantity and then you definately grow to be subtracting it on the finish anyhow. You're left with all of the BS calculations within the core. X is the quantity you selected. X+10 is including 10. two(X+10) is multiplying the outcome by means of two. two(X+10)-18 is subtracting 18. (X+10)-nine is multiplying the outcome by means of one part. (X+10)-nine-X is subtracting the customary quantity. X+10-nine-X X+one million-X = one million No topic what X is, the reply is continually one.

Work backwards?

And maybe she's just REALLY good at math, ya?