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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.

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Why Round Numbers?

Introduction 2

The Key Rule

Key Facts 3

Types of Rounding

Deep Dive 4

Worked Example: Significant Figures

Notes 5

Common Mistakes

Exam Tips 6

Knowledge Organiser: Rounding and Estimation

Summary

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

Exam questions for Rounding & Estimation

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

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