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Significant Figures Counting and Rounding. Mujahid Sheikh Suzanne Halpern. How to…. Rounding. All numbers that are not zero are significant Zeros are significant in two cases Zeros before a decimal point Zeros after the decimal point. To get more SigFigs - PowerPoint PPT Presentation
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Significant Figures Counting and
RoundingMujahid Sheikh
Suzanne Halpern
How to…Counting Rounding
O All numbers that are not zero are significant
O Zeros are significant in two casesO Zeros before a
decimal pointO Zeros after the
decimal point
O To get more SigFigsO Put a decimal point
and add zeros after the decimal point
O To get less SigFigsO Put your number to
the nearest powerO OR Round your
number up to the nearest digit
Sample ProblemsCount and underline the SigFigsO 873 3 SigFigsO 60 1 SigFigO 60. 2 SigFigsO 0.60 2 SigFigsO 720.6370 9 SigFigsO 990.0 4 SigFigsO 99.0 3 SigFigs
Round the SigFigs to the indicated numberO 3 SigFigs
O 20→20.0O 3 SigFigs
O 72000→720 x 10^2
O 2 SigFigsO 729→730
Practice Problems
Count and underline the SigFigsO 198O 120O 120. O 0.6000 O 720.6370 O 88970.04O 78.0
Round the SigFigs to the indicated numberO 3 SigFigs
O 88O 5 SigFigs
O 72000000O 4 SigFigs
O 72697
