High School Math

MISSION STATEMENT: To encourage and promote a greater use of the internet and computer technology in the math classroom. For educators, students, parents and homeschoolers.

Saturday, May 10, 2008

Amusements










More Stuff at www.TheMathWebSite.com.

Number 1089


On a sheet of paper write a three-digit number,
where all the digits MUST be different.
Reverse the order of the three-digits
in the number from last to first.
Subtract the smaller number from the larger number.
If the resulting number is a two-digit number, it will be 99.
Place a zero in front of the two-digit number (99) to make it 3 digits.
If the result is already a three-digit number, just continue.
Again reverse the order of the three-digits in this new number from last to first.
Now add both of these new three-digit numbers together.
The result will be always be 1,089. Why?

523 - 325 = 198 + 891 = 1,089

817 - 718 = 099 + 990 = 1,089

More Stuff at www.TheMathWebSite.com.