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Product #: EMC5014027_TQWhat's the Difference Between a Nail and a Screw? (Resource Book Only) eBookGrade 4Sale! Ships Free!
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This daily science unit for grade 4 presents information and five activities in which students learn that the screw and the wedge are simple machines that change the direction of the force applied to them. Week 2 of 5 on 'Big Idea 6: People invented machines to make work easier.' Includes answer key.
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