Thank-you, Lecka. Yes, it is Everyday Math and the lattice multiplication. I am happy if she has been taught a variety of ways of thinking in order to solve math problems. One particular "way" is not really right or wrong, just impractical for our household. Perhaps you're right and she will already know how to use traditional multiplication. I that case I may have been too hasty in posting a question 🙂 . We will see how this goes!

Thank-you for your suggestions. Practically speaking, I will not be teaching myself new math techniques this year. Our home of 13 children, six of whom are foster children, does not permit me the time or energy to begin a brand new math method with anyone. Our home is full of special needs, and thus I spend a great deal of time personalizing our kids' education, tailoring it, etc., and the curricula we are using works beautifully for the children using it (and does include Math Mammoth, which I forgot to mention). With the 4 different math programs we are currently using, I just won't be making any drastic changes to what I teach. One momma and a big, needy crew means we forge ahead with what we've got. But our foster girl is very bright and learns quickly. I'm sure she will be able to learn traditional math methods, perhaps quicker than I was expecting. I just want it to be a gentle process and was hoping someone had some experience they would be able to share as they made the change from new math to traditional techniques.

I am going to be homeschooling our soon-to-be 5th grade foster daughter this coming school year. She has done very well in the public school, but when I gave her a math placement test to find out what math level she needed here at home, I saw that she solved multiplication problems using new math techniques, which are foreign to me. Her answers were correct, but none of the math curriculum I have used over 18 years of homeschooling has looked anything like the math she was taught. I will be teaching her traditional math techniques, but I'm afraid we will have to back up quite a bit in order to teach her traditional math methods. I don't want to slow her down or discourage her too much, but this may take some time to relearn traditional methods. Has anyone navigated this before, or would anyone be willing to share suggestions? We have used Saxon, Right Start Math, PACES, and Teaching Textbooks for 8 of our kids over the years.