Question 50
Fractions, Decimals and ApproximationThe length of an exercise book is given as 20cm correct to the nearest centimetre. In which of the following ranges of possible measurements does the actual length lie?
- A.19.5 − 20.5cm
- B.19.1 − 20.9cm
- C.19.9 − 20.1cm
- D.19.95 − 20.05cm
- E.19 − 21cm.
Show the answer and explanation
Answer: A (19.5 − 20.5cm)
Explanation
To the nearest centimetre, the length can be up to 0.5 cm either side of 20 cm: 19.5 cm to 20.5 cm.