Why Approximation and Estimation Matter
In June 2025 Singapore’s population was , and the news said "6.11 million". The rounded figure is easier to hold and still true enough.
Section 1 of 7
Learning Outcomes
- Understand the difference between approximation and estimation
- Round off numbers to a given number of decimal places
- Identify significant figures using the 5 rules
- Round off numbers to a given number of significant figures
- Estimate computations by rounding to 1 significant figure
- Apply estimation in real-world contexts (currency, value for money, sampling)
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Practise this
Questions on Approximation and Estimation, marked as you go, with the working shown.