physics lecture about measurement, Lecture notes of Physics

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SIGNIFICANT FIGURE

The numbers of digits reported

for the value of a measured or

calculated quantity, indicating

the precision of the value.

SIGNIFICANT FIGURES

1. All non-zero numbers ARE significant

33.2 3 significant

2. Zeros between two non-zero digits ARE significant. 2051 4 significant figures

3. Leading zeros are NOT significant.

0.0032 2 significant figures

SIGNIFICANT FIGURES

7. For a number in scientific notation: N x 10

x

, all

digits comprising N ARE significant, "10" and "x"

are NOT significant.

5.02 x 10

4

has THREE significant figures:

Rules for mathematical operations

In addition and subtraction, the result is rounded of to the least number of decimal place 100

rounds to 124

• 32.5____

rounds to 167.