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"Estimation of multiplying whole tens and whole hundreds by one digit and two or three digits by one digit" Multiplying two or three digits by one digit PPT courseware
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"Nitrogen and Its Compounds" Important non-metallic elements in chemical production PPT (Lesson 2: Ammonia and ammonium salts)
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"Experiment: Explore the relationship between acceleration, force and mass" PPT courseware on the relationship between motion and force
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