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Costello is wrong. When you multiply 7 by 4 it is 28, not 7 by 14. Costello is wrong because when dividing you can't hold a number. Also when he added 14 he counted the one's place correct but not the ten's place correct. Another set of numbers you could use it 8x15=48. You could find this out very easily.

The problem would be set up like this: XY+X=Z

X= the multiplier

Y= the ones digit

X and Y have to be one of the digits 1-9.

For Example:

X=8

Y=5

8x5+8=48

8x15=48

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Article posted September 24, 2011 at 06:39 PM • comment • Reads 103 • Return to Blog List