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Significant Figures (Sigfigs)

SigFig Rules:

All non-zero digits are significant (211.8 has four sigfigs).
Zeros between non-zero digits are significant (20007 has five sigfigs).
Leading zeros in a number are not significant (0.0085 has two sigfigs).
Trailing zeros are not significant unless there is a decimal in the number (0.0050 has two sigfigs; 4100.0 has five sigfigs).
Trailing zeros in a whole number without a decimal are not significant (1000 has one SigFig).
For conversions - use the same number of sigfigs as the original value.

Rounding after solving a problem:

If the original number was 2.140 x 107
Four sigfigs (2.140); therefore, the answer must also have four sigfigs.
If the product was 1.150672 x 105, then it would need to be rounded to 1.151 x 105.

Examples:

0.00456 - 3 sigfigs

2000 - 1 sigfig

1.20 × 10² - 3 sigfigs

150.0 - 4 sigfigs

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Match the correct number of significant figures to each value.

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