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Great geometry primer on perimeter and area. Listen carefully. Sal explains the concepts so you'll understand them.
Practice this lesson yourself on KhanAcademy.org right now: …
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Introduction to place value blocks
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Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/early-math/cc-early-math-add-sub-100/cc-early-math-add-sub-100-word...
Watch the next lesson:…
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