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Rounding & Estimation

Revise Rounding & Estimation in Number for GCSE Mathematics with 13 exam-style questions and 6 flashcards. This topic appears regularly enough that it should be part of a solid GCSE revision cycle.

Study this topic

1

Why Round Numbers?

Introduction2

The Key Rule

Key Facts3

Types of Rounding

Deep Dive4

Worked Example: Significant Figures

Notes5

Common Mistakes

Exam Tips

Sample Flashcards

Estimation
Round each number to 1 s.f., then calculate
Rounding Rule
Look at the next digit: 0-4 round down, 5-9 round up

Sample Questions

Round 4.673 to 1 decimal place.

  • A. 4.6
  • B. 4.7
  • C. 4.67
  • D. 5.0
1 markfoundation

A student says '3.50 and 3.5 are exactly the same number so they have the same number of significant figures.' Explain why the student is wrong.

2 marksstandard

13

exam-style questions

6

revision flashcards

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