Chapter two was made unnessisarily difficult. I found that we did even use the entire first section of this unit with number lines. At no point did we use number lines through the rest of the course. I had many issues with this unit, everything exept expand and simplify to be exact.
In the end, this unit was poorly conceived in the book and should probly have the first setion left out to allow extra time for harder units.
the khan acedemy link wont work again
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