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馃搻 Mathematics 8 minLesson 27 of 50
Estimating Calculations
Estimation provides a quick check to see if your calculator answers are sensible.
What you will learn
- Round numbers to one significant figure for quick mental math.
- Estimation helps catch errors in complex calculator input.
- Always check if your estimated result is near the final answer.
How to Round Numbers to Significant Figures (2026/27 exams)
Cognito 路 plays in StudyAI
Watch once, then work through the practice sheet.
Practice sheets
3 printable PDFs1
Recall drill
5 questions 路 write-in answer lines
2
Apply it
4 questions 路 write-in answer lines
3
Test yourself
4 questions 路 write-in answer lines
Interactive quiz
Question 1 of 1Estimate 19.8 x 5.1 by rounding.
