Mathematics for IGCSE & O level - Estimation (Section 4 - No. 5)
What is the value of 0.005459 rounded to 3 significant figures?
0.00545
0.00546
0.0055
0.00500
Explication
The 3rd significant digit is 5, and the 4th is 9, which is greater than 5, so add one and the answer is 0.0055