tag:blogger.com,1999:blog-5608233452456893862.post160353623913660805..comments2023-12-13T06:35:58.695-05:00Comments on 3rd Grade Grapevine: How to Subtract the Common Core WaySusan Hardinhttp://www.blogger.com/profile/00935379679924541689noreply@blogger.comBlogger17125tag:blogger.com,1999:blog-5608233452456893862.post-1125397182254222712018-08-23T05:57:20.040-04:002018-08-23T05:57:20.040-04:00It proved to be Very helpful to me and I am sure t...It proved to be Very helpful to me and I am sure to all the commentators here! <a href="https://view.ly/v/EPuUGO2Zqek0" rel="nofollow">https://view.ly/v/EPuUGO2Zqek0</a><br />Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-5608233452456893862.post-9992745569589389382017-10-18T21:02:06.703-04:002017-10-18T21:02:06.703-04:00I'm so frustrated that 3 digit subtraction see...I'm so frustrated that 3 digit subtraction seems to have really killed my daughters confidence.....ex. 402-176 734-182 how can I help her? please Anonymoushttps://www.blogger.com/profile/08183653592408209138noreply@blogger.comtag:blogger.com,1999:blog-5608233452456893862.post-60597831425939081722016-02-29T13:25:07.680-05:002016-02-29T13:25:07.680-05:00How would you do 375 - 89 in your head? How would you do 375 - 89 in your head? Jackiehttps://www.blogger.com/profile/08451404439368372105noreply@blogger.comtag:blogger.com,1999:blog-5608233452456893862.post-74337366963639055892015-03-27T19:53:00.921-04:002015-03-27T19:53:00.921-04:00The way I would do that problem in my head is 2-2 ...The way I would do that problem in my head is 2-2 = 0 and 9-1 = 8. Therefore the answer is 80. So much more simple.Stephen Cooperhttps://www.blogger.com/profile/09907993749859244046noreply@blogger.comtag:blogger.com,1999:blog-5608233452456893862.post-2136809444371839542015-02-11T08:06:47.534-05:002015-02-11T08:06:47.534-05:00I know how to monetize your blog search on faceboo...I know how to monetize your blog search on facebook - Yoogurn's money makingAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-5608233452456893862.post-38295009650050018202014-10-01T21:24:23.856-04:002014-10-01T21:24:23.856-04:00I'm glad that you explained the method. My ch...I'm glad that you explained the method. My child is in second grade is autistic and knows all his times tables and can do math in his head. I needed to learn the pattern so that we can work on this. I don't think it will make a gifted kid hate math. I respect the teacher that posted the process clearly. Not the teacher's fault that public schools are being dismantled. Dr. Tanya Lyn Marchhttps://www.blogger.com/profile/17419915994418944217noreply@blogger.comtag:blogger.com,1999:blog-5608233452456893862.post-78658369137001323372014-08-20T22:30:38.216-04:002014-08-20T22:30:38.216-04:00These unnecessary steps will make the gifted kids ...These unnecessary steps will make the gifted kids hate math. For the kids at the lower end, more steps means more opportunity for careless mistakes or a chance to forget steps. And you would learn a method you would never use in real life why???Anonymoushttps://www.blogger.com/profile/07588984454532835616noreply@blogger.comtag:blogger.com,1999:blog-5608233452456893862.post-23357653949560183552014-05-19T11:59:21.062-04:002014-05-19T11:59:21.062-04:00Sorry but no I would do 92-12 as 2-2 and 90-10 no ...Sorry but no I would do 92-12 as 2-2 and 90-10 no ones and 8 Tens equaks 80. Asking kids to remember 4 addition probs and add them up. Thats just nuts. And to do it mentallly. I get how to do it think it's just so unnecessary.Anonymoushttps://www.blogger.com/profile/00750500185499042530noreply@blogger.comtag:blogger.com,1999:blog-5608233452456893862.post-50754335675737249952014-04-05T23:42:30.328-04:002014-04-05T23:42:30.328-04:00Hi Fred. Lewis Murray left you a good response bel...Hi Fred. Lewis Murray left you a good response below. You are basically just counting up from 12 to 32, and aiming at what many call "friendly numbers" or "benchmark numbers" as you count. We use these friendly numbers because they are easier to use in mental math, when no paper is used. Susan Hardinhttps://www.blogger.com/profile/00935379679924541689noreply@blogger.comtag:blogger.com,1999:blog-5608233452456893862.post-19633281845817516912014-03-06T12:42:25.108-05:002014-03-06T12:42:25.108-05:00This is basically counting from 12 to 32 in steps,...This is basically counting from 12 to 32 in steps, using 5s and 10s when possible. The first step gets us to a numeral ending in 5, the second to one ending in 0, the next adds even 10s to get to the closest numeral ending in 0, the last step finishes up. The left column is the tally counting up. So 12 + 3 + 5 + 10 + 2 = 32. It mimics the way some people do math in their heads. If the question were 92 - 12, it might be 12 + 3 = 15, + 5 = 20, + 70 = 90, + 2 = 92, so the answer would be 3 + 5 + 70 + 2, or 80. Hope that helps.Anonymoushttps://www.blogger.com/profile/10289880315952500768noreply@blogger.comtag:blogger.com,1999:blog-5608233452456893862.post-78267873533387752062014-03-05T15:56:07.185-05:002014-03-05T15:56:07.185-05:00What Method is this called?
32-12 (is the problem...What Method is this called?<br /><br />32-12 (is the problem)<br /><br />12+3=15<br />15+5=20<br />20+10=30<br />30+2=32<br />add the center column up and you come up with the answer. Can somebody break this down for me? Anonymoushttps://www.blogger.com/profile/18055803743148429317noreply@blogger.comtag:blogger.com,1999:blog-5608233452456893862.post-18791893635926581072012-10-19T23:27:19.366-04:002012-10-19T23:27:19.366-04:00We've been using number lines for subtraction ...We've been using number lines for subtraction for a couple of years and if you can get the idea across that subtraction just means finding the difference between to numbers (how much space in between) it really is easier for kids to jump forward instead of trying to get them to count backwards. Kind of like counting change back at a register. For example is something costs $2.99 and you give them a $5 make a number line start at $2.99 and 1 cent to make $3 then $2 more dollars to get to $5. Accuracy will go way up if you can get kids going forward instead of jumping backwards. Unknownhttps://www.blogger.com/profile/16520779686110734360noreply@blogger.comtag:blogger.com,1999:blog-5608233452456893862.post-12595835985293635332012-09-02T15:58:19.325-04:002012-09-02T15:58:19.325-04:00Your anchor charts look great! My 3rd graders hav...Your anchor charts look great! My 3rd graders have the same problem too! I think part of it is that it takes too much time to copy things (that's what they think). They are so used to everything being instant with all the gadgets and computers they are used to dealing with. <br /><br />On another note, I am a fellow 3rd grade teacher and I just found your blog through the Teachers NB forum and I'm now following you! I would love for you to visit my blog when you get a chance!<br />Patti :)<br /><b><a href="http://aseriesof3rdgradeevents.blogspot.com" rel="nofollow">A Series of 3rd Grade Events</a></b>Patti Whitehttps://www.blogger.com/profile/00951600398669278683noreply@blogger.comtag:blogger.com,1999:blog-5608233452456893862.post-50010533462786222972012-08-28T20:25:00.370-04:002012-08-28T20:25:00.370-04:00No, it is definately not just yours! :) I have a ...No, it is definately not just yours! :) I have a student teacher this year, and she was very surprised at this! Susan Hardinhttps://www.blogger.com/profile/00935379679924541689noreply@blogger.comtag:blogger.com,1999:blog-5608233452456893862.post-64608439674879728682012-08-28T20:21:22.576-04:002012-08-28T20:21:22.576-04:00You are correct. Before 3rd grade, this is general...You are correct. Before 3rd grade, this is generally taught with "fact families" in K through 2. In 2nd and 3rd we introduce the "properties of" each operation, and most seem to easily grasp this inverse relationship.For my kiddos, the operation itself with larger numbers (with the need for regrouping) is the tricky part. Susan Hardinhttps://www.blogger.com/profile/00935379679924541689noreply@blogger.comtag:blogger.com,1999:blog-5608233452456893862.post-69449981166620014502012-08-28T18:15:44.221-04:002012-08-28T18:15:44.221-04:00What?!?! Your 3rd graders struggle with copying i...What?!?! Your 3rd graders struggle with copying information off the board too?!?! I thought it was just mine!!! ;) Wonderful anchor charts. Thanks for sharing. Amy<br /><br /><a href="http://griffiths3rdgradegarden.blogspot.com" rel="nofollow">Griffith's 3rd Grade Garden</a>Teachcapadeshttps://www.blogger.com/profile/15953299309344894805noreply@blogger.comtag:blogger.com,1999:blog-5608233452456893862.post-39258295943584685182012-08-28T03:02:01.102-04:002012-08-28T03:02:01.102-04:00subtraction is one of the four basic binary operat...subtraction is one of the four basic binary operations; it is the inverse of addition, meaning that if we start with any number and add any number and then subtract the same number we added, we return to the number we started with.<a href="math.edurite.com/definition-of-subtraction-s24Ti.html" rel="nofollow">Definition of Subtraction</a>Anonymoushttps://www.blogger.com/profile/09491471905259311284noreply@blogger.com