This PowerPoint was created with explicit instruction in mind. It will help teachers present information, develop concepts, demonstrate processes and revise. The language is concise. The graphics are relevant and eye-catching.

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Focus

• describe perimeter
• examine the relationship between the sides of a rectangle and its perimeter
• understand how the formula P = (l + w) × 2 is derived and use it to calculate the perimeters of rectangles
• solve problems involving perimeter