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 Basic Math and Pre-Algebra
 Arithmetic : operations on rational numbers
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Joe Komagawa
Average Member

Japan
11 Posts

Posted - 11/23/2013 :  00:42:22  Show Profile  Reply with Quote
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
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Ultraglide
Advanced Member

Canada
299 Posts

Posted - 11/24/2013 :  00:11:28  Show Profile  Reply with Quote
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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