Pacific-Atlantic Method

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  Non-zero digits are significant.  Ex: 453 kg  All non-zero digits are always significant  # of Sig Fig’s?  3! Rule 1:

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Presentation transcript:

Pacific-Atlantic Method Pacific-Present If the decimal is present, start counting from this side Atlantic- Absent If the decimal point is absent, start counting from this side You are counting starting at the first nonzero digit you encounter and everything after that. This will give you the number of sig figs 0.00825 100.0 6570 300000

Rules for Calculating with Sig Figs Addition/Subtraction Determine which number has the least number of digits to the RIGHT of the decimal point That is how many numbers you can have to the right of the decimal point in your answer Multiplication/Division Your final answer will have the same number of sig figs as the measurement that has the smallest number of sig figs (least precise) 123 x 5.35 658.05 → 658 53.5824 x 2.14__ ? 97.3 + 5.86 103.16 → 103.2 256.89 - 2.671 254.219 → 254.22 12.47 + 7 = 19 Rounded from 19.47 **Section review Qs: 1-4 pg 20 plus: how to do this with a calc