   When   doing   mathematical   equations   there   is   a   rule   that   we   must follow.   A   fancy   term   for   this   is   mathematical   hierarchy.   This   is   a   very important   rule,   if   you   don't   follow   it   you   can   make   some   big   time   mistakes. One   good   thing   about   math   rules   (unlike   English)   there   are   no   exceptions. Most good calculators will follow the rule of mathematical hierarchy. DO ALL MULTIPLICATION AND DIVISION IN THE ORDER GIVEN FIRST AND THEN DO ADDITIONS AND SUBTRACTIONS IN THE ORDER GIVEN! DO EXPRESSIONS IN PARENTHESIS FIRST WORKING FROM INSIDE OUT!       Also for every opening parenthesis you need a closing parenthesis. EXAMPLE: (2+3(4x5)+(12÷4)÷3+2)      do inside parenthesis first.                               4 x 5 = 20 and 12 ÷ 4 = 3 (2+3(20)+(3)÷3+2)            Next multiply 3 x 20 = 60                              And then divide 3 ÷ 3 = 1 (2+60+1+2) Looking simpler now! 65  is the answer. Same Problem with (2+3((4x5)+(12÷4))÷3+2)        Work innermost brackets   an extra set of                                first 4 x 5 and 12 ÷ 4   parenthesis (2+3(20+3)÷3+2)  Now we do another inner bracket 20 + 3 (2+3(23)÷3+2)        Next do multiplication.    3 x 23 (2+69÷3+2)                   Then divide    69 ÷ 3 (2+23+2) 27   See how the answer changes with one extra set of brackets. It changes the priority of solving the problem. Multiplication next to a bracket can either read: 4 x (2+3) or 4(2+3)The sign can be left out. A fraction is nothing more than a division problem. 1/2 = 1 ÷ 2 = 2  1 = .5 these are all the same number. Break down the following problems:    ((6 x 3)÷10)+2(4 ÷ 2)           (((5 x 3 + 5)(12 ÷ 4 - 3))+8 - 2) 1. _________________________ 4. ___________________________ 2. _________________________ 5. ___________________________ 6. ___________________________ 3. Answer ______ 7. Answer ______ Note: You can enter these formulas exactly how they appear, parenthesis and all, with the calculator optionally purchased with this manual from DVC Planners. ORDER IN THE MATH  Please Donate if you find this site helpful. Thank-You! No part of this publication may be reproduced, or transmitted, or stored, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SheetMetalWorkBook.com, Sixth Edition Reformatted for Internet, ©2012 SheetMetalWorkBook.com 