
Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion 
 LinkBack  Thread Tools  Display Modes 
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: 2,155 Thanks: 731 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.


Tags 
book, confusing, division, prealgebra 
Search tags for this page 
Click on a term to search for related topics.

Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Book for Algebra 1  amit  New Users  1  June 29th, 2014 12:30 AM 
a very confusing problem in my math book  dennisdixon  Algebra  4  March 1st, 2013 09:00 PM 
Confusing algebra word problem  matt93  Algebra  3  November 3rd, 2011 08:53 AM 
Algebra book available.  MathloverKK  Math Books  0  October 24th, 2011 03:17 PM 
Order of operation (division) in algebra  sharp  Algebra  10  December 22nd, 2010 04:50 PM 