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🔬 How to use significant figures

Read measurement precision, count significant digits, and round calculations without inventing certainty.

10
lessons
~10 min
to learn
Adults
level
Start the course →

What you’ll learn

  1. Purpose
  2. Counting
  3. Zeros
  4. Leading zeros
  5. Trailing zeros
  6. Addition
  7. Multiplication
  8. Rounding
  9. Exact values
  10. Reporting

Questions this course answers

Which zeros are always significant?

Interior zeros preserve a measured place between nonzero digits.

How should 12.11 + 0.3 be reported?

Addition is limited by the least precise decimal place, tenths.

What limits a product's significant figures?

Multiplication and division use the fewest significant figures among measured factors.

Why is 100 cm in one metre treated differently from a measured 1.00 m?

Defined conversions do not add measurement uncertainty or limit precision.

What is the best time to round a chained calculation?

Intermediate rounding can change the final result.

Grounded in trusted sources

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  • [object Object]
  • [object Object]

Every Wunder lesson is built from real, reputable sources — never invented.

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