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    Casting Out Nines

    Lesson 17 of the 6th R&S teaches how to cast out the nines. The curriculum manual skips this lesson. Has anyone taught this or use it personally? I’d never heard of it before.
    Heidi

    For 2021-22
    dd- 6th
    ds- 3rd
    dd- 1st
    ds- adding smiles and distractions

    #2
    We just did this! I noticed it was eliminated from the plans and remember several families (maybe before it was eliminated?) saying that particular thing was odd and most people just skipped it. I had planned to skip it, but my daughter thought it looked interesting and so did I. We worked through the process and actually enjoyed it, so we are using it. We also find casting out 9s to be a much faster process than redoing the problem (inversely), so we are enjoying using that "skill" to check the answers.
    Christine

    (2022/2023)
    DD1 8/23/09 -Mix of MP 6/7
    DS2 9/1/11 - Mix of SC 7/8 and SC 9/10 (R&S 5, FFL)
    DD3 2/9/13 -SC 5/6

    Previous Years
    DD 1 (MPK, SC2 (with AAR), SC3, SC4, Mix of MP3/4, Mix MP5/6
    DS2 (SCB, SCC, MPK, AAR/Storytime Treasures), CLE Math, Mix of MP3/4, MP5 (literature mix of SC 7/8/MP5)
    DD3 (SCA, SCB, Jr. K workbooks, soaking up from the others, MPK, AAR), MP1, MP2

    Comment


      #3
      Right start calls it check numbers, but it is the same thing. I personally like it because it is cool how it works and it can be very helpful for checking multi digit work. As Christine said, it is much faster than other methods for checking longer problems. It also seems like a nifty thing for eliminating answers on a standardized test if you do those. My guess was it was skipped because someone didn’t understand how it worked or what it could do. I like it and we use it frequent, but it isn’t the end of the world if you miss it.
      Dorinda

      Plans for 2022-2023
      16th year homeschooling, 13th year with Memoria Press
      DD College Sophomore
      DS 11th grade - Lukeion Latin and Greek, Vita Beata, MPOA Divine Comedy
      DS 9th grade - Vita Beata Literature/Classical Studies
      DS 4th grade - 4A with Right Start F, Second Form Latin, AAS 5

      Comment


        #4
        Dorinda and Christine,

        Thanks for sharing your experiences! As my daughter asked me if she solved a problem correctly, it occurred that teaching this method could empower her to know whether she did or not. I may give it a shot and see what happens.

        Heidi
        Heidi

        For 2021-22
        dd- 6th
        ds- 3rd
        dd- 1st
        ds- adding smiles and distractions

        Comment


          #5
          Thank you for this thread! It was a lesson we also initially skipped, but my daughter was intrigued once we reached the review portion of the chapter. It is a nifty thing to do and today was the first time in years I heard her say, "Wow! I really enjoyed math today!"
          Laura H.

          2022-2023:
          DD: 16, special-needs: language processing issues (modified 9M Core), aspiring illustrator, our "Meg"
          DD: 14 (modified 9M Core), aspiring pediatric nurse, our "Jo"
          DD: 9 (modified 4NU) our "Beth"
          DD: 9 (modified 4NU) our "Amy"
          plus homeschool co-op

          Comment

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