Fifth grade was when I first learned the difference between parallel and perpendicular lines. I still remember the worksheet ...

Parallel lines are lines that never cross each other - they keep the same distance apart from each other. When two lines intersect, the opposite (X) angles are equal. On parallel lines, alternate (Z) ...

Stage 5: Justify thinking. A vital habit that many students need to solidify is recontextualizing after they solve ...

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A look at how teachers can have students collaborate across grades on an art project that promotes creativity and teamwork.