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Significant Figures!

Significant Figures!. A.K.A. Sig. Figs. Actual measured #’s, not placeholders Two techniques: Numbers with decimals Numbers without decimals. 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!.

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Significant Figures!

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

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

  3. 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!

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

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

  6. PRACTICE #2 = 3 = 1 = 1 = 4 • 154 • 100 • 10000 • 65010

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

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

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

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