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 Arithmetic : operations on rational numbers

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T O P I C    R E V I E W
Joe Komagawa Posted - 11/23/2013 : 00:42:22
Which of these CANT give an integer divided by 10?
A- sum of 2 odd integers
B- integer less than 10
C- sum of 3 consec. Integers
D- prod. Of 2 primes
E- odd integer
Ans: E
TEXT: presents examples using simple integers to show E is correct
BUT I want to teach students an algebraic expression so they can deal with larger divisors than 10. Is this possible? I am an ESLteacher
1   L A T E S T    R E P L I E S    (Newest First)
Ultraglide Posted - 11/24/2013 : 00:11:28
When presented with problems of this type, you just have to examine the cases to see which one does not fit. There are no algebraic methods as far as I can see.

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