# Life of Fred users....

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I just bought several levels for fun. Ds is not quite getting addition, subtraction, multiplying, and dividing with opposite signed integers. I have searched the TOCs of LOF Fractions, D&P, PreA 1, and PreA 2, but can't seem to find it. Could be my congested, fuzzy head right now, but my brain can't seem to locate this topic. I just want to see how he presents it so I can perhaps give ds a different perspective. I know it has to be there somewhere because I see negatives used in the PreA books. I just can't locate where it is introduced.

Can someone help me?

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It's really not in there much from what I've seen (DD is at chapter 17 in Pre-Algebra 1, having done Fractions and Decimals/Percents). I'm guessing it's in one of the elementary books and is expected to have been covered as part of the four operations requested as a prerequisite to LoF Fractions.

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yeah, I'm betting the earlier books cover this. We've only done a few so far (A-D) but they integrate explanations of some more complicated things even in those, so I'm betting opposite signed integers is covered in these.

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I just checked the TOC of all the books, from Apples to Pre-Algebra with Biology. The only mention I found? Ch. 4 of Apples, where it talked about temperatures below zero. That's it. :001_huh:

Then it's covered in Ch. 2 of Beginning Algebra. (I don't have Pre-A w/ E, so can't speak to that one).

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Well at least I am not crazy. I have searched the TOC for all of the books that I have here (Apples, Butterflies, Cats, Fractions, Decimals, PreA 1, and PreA 2), but can't find it.

I emailed Mr. Schimdt and will post what he says.

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Well, here it is:

Adding, subtracting, multiplying, and dividing using negatives numbers is a bit tricky. That's why we hold off doing them until Life of Fred; Beginning Algebra. There is no need to "back up."

With my best wishes,

Stan

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Alrighty then!! :D Thanks for posting.

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