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Negative numbers

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I am wanting to move my DD from Singapore into AoPS Pre A next year, but have noticed the need to have covered negative numbers.  Singapore has not touched this yet, so I'm needing something cheap to teach negative numbers over the summer.  I could just teach it w/o a resource, but I've got a full plate right now so just don't want to.  Suggestions?  Are negative numbers covered in any of the Key to books?


Anyone else familiar with any other gaps between Singapore 6 and AoPS Pre Algebra?

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That would probably be the only gap.  MM would have a cheap little topic book.  FWIW, I vaguely recall teaching the topic without a resource in a very short timeframe.  IIRC, there is a conceptual discussion of negation and subtraction in chapter 1 of AoPS Prealgebra that might help firm everything up.

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