
Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion 
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October 26th, 2014, 01:05 AM  #1 
Newbie Joined: Oct 2014 From: Washington Posts: 2 Thanks: 0  Division example in PreAlgebra book seems confusing
Hello guys and girls. I purchased a used copy of PreAlgebra Demystified, 1st edition from the bookstore recently in an effort to build myself a solid foundation for math success. I have quite a lot of catching up to do, and to be honest I'm not having an easy time with division. My book provides an example that left me confused: Divide 543 by 37 I get to a point where the problem looks similar to the following: Code: _1__ 37543 37_ 173 How is that determined? I am mystified as to why the book's author would exclude the reasoning for the statement. 
October 26th, 2014, 01:37 AM  #2 
Senior Member Joined: Nov 2010 From: Indonesia Posts: 2,001 Thanks: 132 Math Focus: Trigonometry 
$\displaystyle 37\times4=148$, which is less than 173. $\displaystyle 37\times5=185$, which is more than 173, thus 5 is too large. 
October 27th, 2014, 02:12 AM  #3 
Senior Member Joined: Apr 2014 From: Glasgow Posts: 2,161 Thanks: 734 Math Focus: Physics, mathematical modelling, numerical and computational solutions 
I imagine many people don't know their 37 times table, so the book is suggesting a subtle trick where you try looking only at the tens digit first. Monox's result is the best one, but can be tricky to do in your head.


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