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Scratch my head? can you figure this one out?
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Cowboycorn
Posted 8/29/2009 22:14 (#829364 - in reply to #829240)
Subject: RE: Scratch my head? can you figure this one out?


north central Oklahoma
Sunshine is right. I had a teacher back in the 60's who had us verify sums of two or more numbers. She called it "casting 9's". Don't ask me how I did it now, but suffice it to say that it was all predicated on the intiger "9" and the sum of the two or more operands would equal the final result. Look at the table and see that each number whose sums add up to 9 have the same guess item in that cell. No matter what number you pick, when you subtract the two digits from that number will give you a number whose digits will equal 9. Math magic.

Coincidentally, pick the same number over and over, and the guess items for you number will change each time.

Edited by Cowboycorn 8/29/2009 22:16
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