Date: Tue, 27 Oct 1998 20:56:56 -0500
I am an upgrading instructor at a drop-in program in Regina. One of my students is taking General Math 30 through correspondence, and we have run into some confusing instructions. The section is about divisibility rules, and we did just fine up until the rule for Divisibility by 11. The statement is as follows:
(sum of odd-numbered digits) 8 + 5 = 13
There then follows a series of numbers which, although we tried to use the rule, simply don't work. Using the rule (as we interpret it) indicates the number should not be divisible by 11, but when actually solved, the rule didn't necessarily make sense. (Does
Please save my sanity!!!!!!
Pat Duggleby email@example.com
Now try 9361. 1 and 3 are in odd positions and 6 and 9 are in even positions. 1+3=4 and 9+6=15. Subtracting the smaller from the larger gives 15-4=11 and hence 9361 is divisible by 11.
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