Yes, I also have a son that is able to do advanced math, but completely unable to do simple addition and subtraction.
We are doing the math in Singapore that corresponds with Bigger. I am reinforcing with a different math program to teach him the BASICS (addition and subtraction) that he is VERY VERY behind on. I blame public school not recognizing his learning disabilities and just skipping on ahead when they saw he wasn't grasping early math concepts. But it's hard going back and having him re-learn something his younger brothers already know.
Sorry to ramble on... LOL
Anyway, I have figured out with my 3 boys that when it comes to math, I have to limit them to 20 minutes max. After that, they really just aren't able to pay attention. Once I put a time limit, and told them that as long as they are TRYING and have a good attitude, when the timer goes off they are DONE, there were alot less tears of frustration, and a much better attitude. Doing the singapore, hasn't been an issue. They're usually done with no problems.
As far as the vocabulary. My son is a horrible speller and reader. He's improving, but he's behind his brother in kindergarten. We have a kids dictionary ($4 at Half Price Books) and so far every single word has been in this dictionary. Together, we find the words (I sometimes narrow it down to "it's on this page, could you find the word, please?" Then we read the word and definition together. I usually ask him what the word means, in HIS own words. Then he writes the definition on the card.
I have him verbally tell me the sentence, and write it down. It doesn't really take that long.
I never have had him FILE the card in the box, we just place it in.... Hmmmmm... now I'm just realizing that would be a good way to teach alphabetizing.... just never thought about it. I saw that in the book, but for some reason it just didn't CLICK until now. Yeah, I'm a dork. LOL
I have 2 other boys, one with serious health issues. I have found it pretty easy to put my son on a task like handwriting book, math workbook, Grammar, etc... while I need to do things. As long as I'm within close enough distance to keep him from wandering off to the toys, it works fine. It's very easy to say, "please go ahead and work on your math workbook while I give your brother his treatments."
If I understand it correctly, you're going to start in the fall? I know before I completely committed to this program, we spent one saturday morning in PRACTICE homeschool doing a typical day of Bigger. Then I asked the boys what they liked. What they didn't like. I tried to give them a voice, while still ensuring they are getting what they need. I STILL ask them what they think. Not that I need validation, but because they know better than anyone what works for them.
What's interesting is that so far, the things they didn't like, or didn't work, are the things I personally picked that I thought was better (for example, Handwriting without Tears cursive). Everything that Carrie set up to do with Bigger they have liked. Ok, the exception to that MIGHT be the book of Laura Ingalls Animal Adventures. Because it has a GIRL on the cover, and therefore is NOT a book for boys.

We havent even read the book yet, and they're devestated I'm expecting them to read a GIRL BOOK. Makes me wanna dress them in pink and sparkes
