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Paper 1
Number Essentials
Foundation
Use a number line to reason about rounding and scale.
Key Facts
- Last-minute priority: rounding, standard form, and percentage change.
- Estimate first to catch silly errors.
- A number in standard form looks like A × 10^n where 1 ≤ A < 10.
- Use place value columns when rounding.
Topics Covered
Rounding & Estimation
What you need to know
- •Round to 1 s.f. fast.
- •Estimate by rounding first, then calculate.
Exam Tips
- State your rounded values before multiplying.
Standard Form
What you need to know
- •Move the decimal until the number is between 1 and 10.
- •Count the moves for the power of 10.
Exam Tips
- Write the power of 10 clearly and check the size.
Key Terms
Standard form
A × 10^n where 1 ≤ A < 10.
Significant figures
Digits that show a number’s precision.
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Common Exam Questions
Write 0.00052 in standard form.
2 marksmediumPaper 1
Model Answer
5.2 × 10^-4
What examiners want to see
- ✓Use a number between 1 and 10.
- ✓Correct power of 10.
Round 5387 to 2 significant figures.
1 markeasyPaper 1
Model Answer
5400
What examiners want to see
- ✓Identify the third significant digit to round.
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