Estimation & bounds
Edexcel GCSE Maths revision on Estimation & bounds. Aligned to the Pearson Edexcel GCSE Mathematics 1MA1 specification. This bank has 16 practice questions on this topic.
Sample questions (3 of 16)
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Question 1
Estimate 49 x 21 to 1 sig fig.
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Answer: 1000
Estimation: round numbers to 1 significant figure, then calculate. 49 -> 50; 21 -> 20. 50 x 20 = 1000. Actual answer: 49 x 21 = 1029 (close).
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Question 2
Estimate the value of 297 / 31.
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Answer: 10
Round to 1 sig fig: 297 -> 300, 31 -> 30. 300 / 30 = 10. Actual: 297/31 = 9.58 (close to 10).
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Question 3
A measurement is given as 12.4 cm to the nearest 0.1 cm. The LOWER BOUND is...
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Answer: 12.35
If a measurement is given to the nearest 0.1, the actual value lies within +/- 0.05. So 12.4 means anything from 12.35 (inclusive lower) to 12.45 (exclusive upper).
Want to test yourself on the remaining cards for this topic?
13 more questions on Estimation & bounds — plus mistakes tracking and spaced repetition across the whole Maths spec.