Significant Figures Worksheets for Class 9, 10 & O-Level

Significant Figures Worksheets for Class 9, 10 & O-Level (With Answers)

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Significant figures are a high-scoring but mistake-prone topic for Class 9, Class 10, and O-Level students. The best way to master them is structured worksheet practice, moving from basics to exam-level problems.

Below are ready-to-use worksheet sections, designed exactly according to school and O-Level exam patterns.

Worksheet 1: Identifying Significant Figures

(Class 9 – Foundation Level)

Find the number of significant figures in each value:

  1. 0.00456
  2. 12.30
  3. 450
  4. 450.0
  5. 7.080

Answers:

  1. 3
  2. 4
  3. 2
  4. 4
  5. 4

Worksheet 2: Rounding to Significant Figures

(Class 9 & 10)

Round each number to the given significant figures:

  1. 36.478 → 3 SF
  2. 0.09876 → 2 SF
  3. 15490 → 4 SF
  4. 5.999 → 2 SF

Answers:

  1. 36.5
  2. 0.099
  3. 15500
  4. 6.0

Worksheet 3: Addition & Subtraction (Decimal Places Rule)

(Class 10 Level)

Calculate and round correctly:

  1. 12.45 + 3.2
  2. 18.003 − 2.1
  3. 100.0 + 23.456

Answers:

  1. 15.6
  2. 15.9
  3. 123.5

Worksheet 4: Multiplication & Division (SF Rule)

(Class 10 & O-Level)

Solve using correct significant figures:

  1. 2.4 × 3.567
  2. 12.0 ÷ 4.56
  3. 0.025 × 1.20

Answers:

  1. 8.6
  2. 2.63
  3. 0.030

Worksheet 5: O-Level Exam-Style Mixed Questions

(O-Level Focus)

  1. (3.45 × 2.1) ÷ 0.056
  2. 14.00 − 3.678
  3. (0.0045 + 1.23) × 2.0

Answers:

  1. 130
  2. 10.32
  3. 2.5

Common Worksheet Mistakes to Avoid

  • Rounding before completing the calculation
  • Mixing decimal places with significant figures
  • Ignoring the least precise value
  • Writing answers with extra digits

Teacher & Student Tip

👉 Always ask before rounding:
“Is this addition/subtraction or multiplication/division?”

That one question can save multiple exam marks.

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