Units & Measurements
Class 11 · Units & Measurements
Significant Figures
Watch rounding in action — see how measurements round to the correct number of significant figures.
Key Notes
01
All non-zero digits are significant; zeros between non-zero digits are significant.
02
Leading zeros are NOT significant; trailing zeros after a decimal ARE.
03
In multiplication/division, result has as many sig figs as the LEAST-precise factor.
04
In addition/subtraction, result has as few DECIMAL PLACES as the least-precise term.
Important Points
0.00450 has 3 sig figs (4, 5, 0); 1200 is ambiguous — use scientific notation 1.2×10³ (2 sf) or 1.200×10³ (4 sf).
Significant Figures notes from sciphylab (also known as SciPhy, SciPhy Lab, SciPhy Labs, Physics Lab). Class 11 physics revision for JEE Mains, JEE Advanced, NEET UG, AP Physics 1/2/C, SAT, and CUET-UG.