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Perimeter, area and volume · Usually met around P4

Perimeter and area

From “Counting perimeter” to “Area of composite shapes”, step by step, each skill with its methods, worked examples and answers.

Skills in this topic, easy to hard

  1. Counting perimeterCount piece by piece: across, then up and down
  2. Perimeter of composite shapesA side not marked: use the side opposite
  3. What area isCover with one unit and count
  4. Counting squares for areaCount row by row; two halves make one
  5. Perimeter and area of rectangles and squaresPerimeter = (length + width) × 2
  6. Area of composite shapesCut into rectangles, or big rectangle less the gap
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