Significant Figures! A.K.A. Sig. Figs..

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Presentation transcript:

Significant Figures! A.K.A. Sig. Figs.

Actual measured #’s, not placeholders Two techniques: Numbers with decimals Numbers without decimals

Zero's in front of the number do not count. NUMBERS WITH DECIMALS Zero's in front of the number do not count. All other digits including the ZERO’S at the end are significant!

PRACTICE #1 100.0 0.002 2.04 0.023420 = 4 = 1 = 3 = 5

NUMBERS WITHOUT DECIMALS All digits count except 0’s at the end. Sandwiched zeros count!

PRACTICE #2 = 3 = 1 = 4 154 100 10000 65010

PRACTICE #3 = 5 = 3 1000.0 10001 1.00 x 105 4.24 x 107

SUMMARY 0’s in front don’t count No decimal? 0’s in back don’t count Sci. Not.? All digits count!

From now on put all answers into scientific notation! Your answer: 100 Only 1 sig fig! 1.00 x 102 From now on put all answers into scientific notation!