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並前往https://www.khanacademy.org/math/cc-fourth-grade-math/imp-place-value-and-rounding-2/imp-intro-to-place-value/v/place-value-blocks

Place value blocks (video) - Khan Academy

it is esy it justblocks that have tens liki 10 20 30 40 50. 2 comments. Comment on patrick's post “it is esy it justblocks t...” (1 vote).

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