Sig Fig's and scientific notation help?

How would you put them in scientific notation?



1. 20.0890



2. 199.900



3. 35,000



Round off these numbers until you get to 3 sig figs.



1. 20.0890



2. 199.900



3. 35,000



Thank You! I have my first Chem. test tommarow!

Sig Fig's and scientific notation help?
When changing to scientific notation the first number can not be higher than 10 and will only include significant digits, and the power of ten is how many places you have moved the decimal to get there so:

20.0890 = 2.00890 *10

199.900 = 1.99900*10^2

35000 = 3.5*10^4



With regards to significant figures all non-zero numbers are significant. Zeros are significant only when they meet one of the following conditions: a) a zero is between significant digits b) a zero is to the right of a significant digit and to the left of an expressly noted decimal point or c)a zero is to the right of a decimal point AND to the right of a significant digit

20.0890 has 6 significant digits 20.1 has 3

199.900 has 6 significant digits "200." has 3 - remember however "200" only has 1 sd (notice there is no decimal point)

35000 only has 2 sd's if you want three you either have to express it in scientific notation (3.50*10^4) or place a bar over the first 0



Hope that helps!
Reply:1)2.0089 x 10^1

2)1.999 x 10^2

3)3.5 x 10^4



1) 20.1

2) 200.00

3)35000 the zero in middle having an over-bar to become significant



0.00250 has already 3 significant figures



best answer?

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