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First you determine the number of significant figures, or the amount of digits valid to what you are calculating.

Second you chose one digit farther and determine if that number is

a. less then 5

b. 5

c. greater then 5

If (a) then you round "down" to one digit less

If (b) or (c) then you round "up" adding one to the preceding digit

EX rounded to the hundredths place:

2.3333 (a) --> 2.33

2.3555 (b) --> 2.36

2.3381 (c) --> 2.34

Rounding to 0 can occur depending on where you're rounding to:

4.9 --> 5.0

3.29 --> 3.30

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16y ago

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