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solvingt

by Mark Baltazar
(Adelaide)












































If the population of town was 20456 in one census and 17240 in another, what was the difference?

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Feb 17, 2010
Numerical Difference
by: Staff

The problem


If the population of town was 20456 in one census and 17240 in another, what was the difference?


The solution


What kind of difference? Numerical or percent? Since you didn’t specify, I’ll assume you simply want to know how to compute the numerical difference.


To find the numerical difference, simply subtract one number from the other. The question is, which number should be subtracted from which?


If the census listed as 17240 was completed in an early year, and the census listed as 20456 was completed in a more recent year, the population has increased by 3,216:

20,456 – 17,240 = + 3,216 (I am making an issue of the “+” sign, because the population has grown)


The opposite is also true:
If the census listed as 20456 was completed in an early year, and the census listed as 17240 was completed in a more recent year, the population has decreased by 3,216:

20,456 – 17,240 = – 3,216 (The “–” sign shows that the population has decreased)



Staff
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