Significant Figure

In measurement, significant figures relate the certainty of the measurement.
As the number of significant figures increases, the certainty of the measurement increase, which means we are more certain about what we have measured.
In the SPM syllabus, the magnitude of a physical quantity is usually rounded up to 3 or 4 significant figures.

Example:
speed of light in a vacuum = 299 792 458 ms ^-1

= 3.00 × 10⁸ ms^-1 (to 3 significant figures)

learn more form Form 4 Modern Mathematics .

Polish my skills:

Write your answer in 3 significant figures
1. The mass of insect is 0.006 g
2. The height of Petronas Twin Towers is 452 000 mm
3. The total area of Malaysia is 329750 km²