Number 8
4 marks · NormalA rectangle measures 1.5 metres by 80 centimetres.
Convert 1.5 metres to centimetres.
Find the area of the rectangle in cm².
Write your answer to part (b) in m².
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
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(a) 150 cm
(b) 12000 cm²
(c) 1.2 m²
Common mistakes: Not converting all sides to the same unit before calculating area; Incorrect conversion from cm² to m²
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · 1.5 m = 150 cm.
M1 (b) · 1 mark · Correct method for area (rectangle: length × width) using cm.
A1 (b) · 1 mark · Area = 150 cm × 80 cm = 12000 cm².
A2 (c) · 1 mark · Correct conversion to m²: 12000 cm² = 1.2 m². (follow-through)
Worked solution
(a) 1 m = 100 cm, so 1.5 m = 150 cm.
(b) Area = length × width = 150 cm × 80 cm = 12000 cm².
(c) 1 m² = 10,000 cm². 12000 cm² ÷ 10,000 = 1.2 m².