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"Letters Can Represent Numbers" Integers and their addition and subtraction PPT courseware 3
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"Continuous addition, continuous subtraction and mixed addition and subtraction" PPT courseware
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"Letters Can Represent Numbers" Integers and their addition and subtraction PPT courseware 3
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"Water Energy and Wind Energy" mechanical energy and its transformation PPT courseware
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"Water Energy and Wind Energy" mechanical energy and its transformation PPT courseware
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"Mechanical Energy" Mechanical energy, internal energy and their transformation PPT courseware
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"Kinetic energy and potential energy" work and mechanical energy PPT teaching courseware
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