UNIT 2: MEASUREMENT Topics Covered:  Significant Digits.

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Presentation transcript:

UNIT 2: MEASUREMENT Topics Covered:  Significant Digits

SIGNIFICANT FIGURES

UNIT OBJECTIVES  Understand how measurements represent accuracy and precision and how significant digits represent this  Make measurements to correct number of significant digits  Make calculation to correct significant digits  Round numbers to correct significant digits

SIGNIFICANT FIGURES The answer to “What should I round to?” ‘Sig Fig’:

SIGNIFICANT FIGURES Quick geography review…

SIGNIFICANT FIGURES Pacific/Atlantic Rule Start from the Pacific if… Start from the Atlantic if…

SIGNIFICANT FIGURES Determine the number of sig figs in… a a.4,600,000 a.2406 a a b a.12,000 a a b.3,650

SIGNIFICANT FIGURES Round the following to 3 sig figs… Round the following to 4 sig figs… a.173,792 a b a.30.0 a.249,441 a b.12,049,002 a

SIGNIFICANT FIGURES Multiplication/Division Rule 1.Count the number of sig figs in each number 2.Do math as normal 3.Round the answer to

SIGNIFICANT FIGURES Perform the following calculations… a x 270 a.36,000 ÷ 1245 a x 12

SIGNIFICANT FIGURES Perform the following calculations… d ÷ 3 d.125 x e.6000 ÷ 2.53

SIGNIFICANT FIGURES Addition/Subtraction Rule 1.Put a ‘hat’ over the last sig fig in each number 2.Do math as normal 3.Round the answer to

SIGNIFICANT FIGURES Perform the following calculations… a a.120, a.140,

SIGNIFICANT FIGURES Perform the following calculations… d.2.24 – d.12, e.450 – 12.8