Mathematics for IGCSE & O level - Limits Of Accuracy (Section 3 - No. 11)
The length of a rectangle is 19 cm (correct to the nearest cm) and its width is 27 cm (correct to the nearest cm). Which of the following is/are a possible area of this rectangle?
513 cm²
513.0 cm²
511.75 cm²
515.25 cm²
Explanation
Upper bound 27.5cm, 19.5cm; Lower bound 26.5cm, 18.5cm; therefore: 18.5 * 26.5 = 490.25 cm², 19.5 * 27.5 = 536.25 cm²; The area could be between 490.25cm² and 536.25cm². So, any values between these values are possible.
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