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Quadrat area unit conversion
Students estimated the population of limpets on a sea shore. The students were given a square quadrat. Figure 2 shows the quadrat.
Calculate the area of the quadrat in m².
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Marking points
- 1 Uses a correct conversion or equivalent square-area calculation.
- 2 Reaches 0.25 m² (or ¼ m²).
Full-mark answer
50 cm = 0.5 m. Area = 0.5 m × 0.5 m = 0.25 m².
Why this answer loses marks
I multiplied the side lengths but left the area in square centimetres.
The requested unit is square metres, so the area-unit conversion is still missing.