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Topic: Help on a math problem please!!!
Message: Posted by: Walking Bob (Apr 23, 2009 10:05PM)
My daughter came home with what I think is a pretty tough math assignment. It may take some magic to solve but I though maybe someone would have some ideas.

She needs to make a true subtraction problem using the numbers 1 - 9. All numbers must be used and can be used only once.

Sample give was

486
-359
_________

127


Any help or ideas would be appreciated. She needs 15 examples.

Thanks and have a nice day,

Walking Bob in Iowa
Message: Posted by: Scott Cram (Apr 23, 2009 11:08PM)
If she's allowed to get creative, how about:

[code] .486
-.359
-----
.127[/code]

[code] 4.86
-3.59
-----
1.27[/code]

[code] 48.6
-35.9
-----
12.7[/code]

BTW, if you have Martin Gardner's 3rd book, [i]New Mathematical Diversions[/i], check out Chapter 19 ("Nine More Problems"), where approaches to a similar problem are discussed in detail.

There are some solutions discussed in that article, including:

[code] 972
-654
-----
318[/code]

and

[code] 567
-438
-----
129[/code]

Heck, if you want a computer to solve it for you, go to the [url=http://www.tkcs-collins.com/truman/alphamet/alpha_solve.shtml]Alphametics Puzzle Solver[/url], and type in for the summand words:

ABC
DEF

For the sum word enter:

GHK

You'll get the answers as addition problems, but that's easily turned around to a subtraction problem. Also, some of the solutions presented will use a 0, and that sounds like it's not allowed in the assigned problem, so make sure to skip those.
Message: Posted by: Walking Bob (Apr 24, 2009 07:09PM)
Thanks Scott for the ways to solve this problem.

Walking Bob