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CTC math...full program or supplement?

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As far as I know Critical Thinking Company has Understanding Geometry and Understanding Algebra, both geared to grade 7-9.

We used Understanding Geometry during grade 7+8 along AoPS Pre Algebra.

This was almost enough for our required grade 8 exams.

Understanding Geometry covered what we needed for grade 7/8. We did no other geometry at the time.

We liked the book.

But some other people had different experiences.

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