⇐ Back Working with significant figures Identifying significant-figures Non-zero digits are always significant. Zeros between non-zero digits are always significant. Leading zeros are never significant. Trailing zeros are only significant if the number contains a decimal point. Show Examples Hide Examples Examples of Significant Figures Number How Many Significant Figures? Which Figures are Significant? 4 1 4 0.3 1 3 0.07 1 7 40 2 4 0 0.30 2 3 0 1.4 2 1 4 0.41 2 4 1 0.0083 2 8 3 500 3 5 0 0 7.01 3 7 0 1 0.00510 3 5 1 0 60.00 4 6 0 0 0 6000 4 6 0 0 0 0.060230 5 6 0 2 3 0 0.709400 6 7 0 9 4 0 0 Identifying significant-figures Non-zero digits are always significant. Zeros between non-zero digits are always significant. Leading zeros are never significant. Trailing zeros are only significant if the number contains a decimal point. Rounding Rules When rounding significant figures the standard rules of rounding numbers apply, except that non-significant digits to the left of the decimal are replaced with zeros. Level 1 Level 2 Level 3 Level 4 Level 5 Identify significant figures Number of significant figures: Significant figures are: ? → Check Next Completed × Well done! You earned all 3 trophies! Enroll now to get trophies Attempts: 0 ? Get a score of 10 to earn a gold trophy! Round to the nearest one significant figure ?→ CheckClear Next Reset Hint Hide Hint Completed × Well done! You earned all 3 trophies! Hints used: 0 Enroll now to get trophies Attempts: 0 ? Get a score of 10 to earn a gold trophy! Round to the nearest two significant figures ?→ CheckClear Next Reset Hint Hide Hint Completed × Well done! You earned all 3 trophies! Hints used: 0 Enroll now to get trophies Attempts: 0 ? Get a score of 10 to earn a gold trophy! Round to the nearest three significant figures ?→ Check Next Hint Hide Hint Completed × Well done! You earned all 3 trophies! Hints used: 0 Enroll now to get trophies Attempts: 0 ? Get a score of 10 to earn a gold trophy! Round significant figures Round to: 1 s.f. 2 s.f. 3 s.f. 4 s.f. ? Check Next Completed × Well done! You earned all 3 trophies! Enroll now to get trophies Attempts: 0 ? Get a score of 10 to earn a gold trophy!