tag:blogger.com,1999:blog-5964889903484807623.post8778920502661856524..comments2020-01-17T22:35:11.961-08:00Comments on Questions?: Proper-taysDavid Coxhttp://www.blogger.com/profile/06277427735527075341noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-5964889903484807623.post-48441374874076719412010-09-14T12:21:27.719-07:002010-09-14T12:21:27.719-07:00No, I'm not abandoning properties. In fact, I...No, I'm not abandoning properties. In fact, I'm using them more often this year than I ever have. I think the key is to use them as a means to an end and not as an end in and of themselves. A property is a great answer to the question "And why can we do that, again?"David Coxhttps://www.blogger.com/profile/06277427735527075341noreply@blogger.comtag:blogger.com,1999:blog-5964889903484807623.post-77876609428963727482010-09-11T05:25:53.723-07:002010-09-11T05:25:53.723-07:00I refer to these properties throughout the year as...I refer to these properties throughout the year as students prove the exponent rules, solve equations etc. I point out the relevance of the mathy rules when multiplying biggish numbers without paper. I attempt to impress on the students that without the basic axioms and properties, the math collapses. I didn't realize the purpose of the properties until after I took geometry in high school. My course was virtually all proof writing so relying on axioms and theorems was paramount to success. I actually miss the proof emphasis because I think it forces students to build simple yet solid arguments to support their work. "You wanna be a lawyer/sales person/manager of people/teacher? Learn to put together a sound argument." <br /><br />So I say stick with the properties...I think as kids move through the math curriculum their understanding increases and much later (college or perhaps when they begin to teach) they will remember you emphasizing the properties.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-5964889903484807623.post-84110700670946444512010-09-05T22:38:50.502-07:002010-09-05T22:38:50.502-07:00Nice lesson to drill in conceptual understanding.
...Nice lesson to drill in conceptual understanding.<br /><br />I also like @CalcDave's commment about 'teach a computer' though I'm not sure students can appreciate it as much.<br /><br />When I taught this, I emphasised literacy skills. Some kids know the meaning of 'commute' and more know 'associate'. From here, they can guess at meanings - commute for travelling (move terms) and associate for linking or grouping. In this way, they can have an educated guess if they ever see the terms.Malynhttps://www.blogger.com/profile/03817938355737942929noreply@blogger.comtag:blogger.com,1999:blog-5964889903484807623.post-28407319144152947972010-08-25T11:47:20.294-07:002010-08-25T11:47:20.294-07:00I can see the value. "In your head, multiple...I can see the value. "In your head, multiple 120 times 30." (pause) "Now, did anyone make the chart like you would on paper? How many of you did something like 12 * 3 = 36 and then add 2 zeroes? If you did it that way, you're right! But how can we <i>justify</i> your thought process? How could we teach a computer to do it your way?"CalcDavehttps://www.blogger.com/profile/14039458440867020542noreply@blogger.com