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 Oct 1 revised Why is the word “of” equivalent to multiplying in fraction word problems? Include examples from percent problems. Sep 25 answered Why is the word “of” equivalent to multiplying in fraction word problems? Jun 26 revised Area dimensions added 17 characters in body Jun 26 revised Area dimensions added 1 character in body Jun 26 revised Area dimensions added 29 characters in body Jun 26 revised Area dimensions deleted 39 characters in body Jun 26 revised Area dimensions added 15 characters in body Jun 26 revised Area dimensions added 9 characters in body Jun 26 revised Area dimensions added 119 characters in body Jun 26 revised Area dimensions added 8 characters in body Jun 26 revised Area dimensions added 157 characters in body Jun 26 revised Area dimensions added 156 characters in body Jun 26 revised Area dimensions deleted 19 characters in body Jun 26 answered Area dimensions Apr 24 comment What is the answer to this hard problem for 4th graders? What kind of 4th grade teacher would ask this question? Mar 26 comment Are variables logical or non-logical symbols in a logic system? Perhaps this will help. Mar 26 comment What does $\in$ mean? Perhaps this will help. Mar 25 comment Could somebody please help me prove this using the properties of real numbers introduced in elementary algebra? I think there is a typo in your sentence "Your question is (basically): if a $\in$ F, how do we know that a/1 = 1?" I believe the question asks how do we know that a/1 = a. Feb 13 revised When an equation has no solutions, denote it with $x\in\varnothing$. added 442 characters in body Feb 13 comment How do you read the symbol “$\in$”? Simply read it as "what y can be replaced by belongs to"