Question

How many significant figures are there in the following values?

a) 0.25 × 10^−5=

b) 109.00=

c) 0.07 × 10−9=

d) 0.109=

Answer 1

Number of significant figures:

A.

0.25*10^-5 = 2 significant figures

Rule: Zero before decimals are not calculated as significant figures.

B.

109.00 = 5 significant figures

Rule: Zero after decimals are calculated as significant figures

C.

0.07*10^-9 = 1 significant figures

Rule: All trailing zeros that are placeholders are not significant

D.

0.109 = 3 significant figures

Rule: zero between numbers are significant.

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