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From L ( R, 1st cylinder = ____; 2nd cylinder = ____; 3rd cylinder = ______ There are ONLY two rules to remember when counting the # of Sig Figs. Rule #1: Dont start counting ______ you get to a number that isnt a _______. Rule #2: Once you ________ counting, dont stop till youve counted ____ the ______, including ______. Next, you need to know some geography. On what side of the U.S. is the Pacific Ocean, left or right? ______On what side of the U.S. is the Atlantic Ocean, L or R? _________ How many sig figs are in this number: 273.5200? Ask yourself: Is the decimal point present or absent? Answer: Present Count from first non-zero number starting at the P________ side. _____ sig figs Examples: 2.55 = _____ sig figs; 0.2500 = ______ sig figs; 100.25 = ______ sig figs More examples: 12.50 = _____ sig figs; 0.0050 = ____ sig figs; 0.0003 = ____ sig figs The first step is always to ask yourself: Is the decimal point present or absent? 18,000,000 Answer: Absent; Count from first non-zero number moving from the A_______ side. = _____ sig figs Examples: 135 = _____ sig figs; 100 = _____ sig figs; 10,500 = ____ sig figs More examples: 350 = ___ sig figs; 17,500 = ____ sig figs; 135.0 = ___ sig figs 0.0020 = ___ sig figs; 27.02 = ____ sig figs; 2060 = ____ sig figs For multiplication and division: you answer can not be more precise than the least precise measurement. Think _________ ____. You and your lab partner, Sloppy Joe, have been assigned to find the area of your lab table. You carefully measure the length, and find it to be 233.65 cm. Sloppy Joe casually slides the meter stick along the width, suggests that it measures about 200 cm. 233.65 x 200 = 46730 (5 s.f.) (1 s.f.) Answer must be recorded as 50,000 cm2 It can have only one sig fig. Your answer MUST have the same number of sig figs as the factor with the _________ number of sig figs. 610 x 6.20 = 3782 (__ s.f.) x (___ s.f.) What is the correct answer? _______ **The rule for addition and subtraction is different; you wont have to memorize that one. However you will need to know the rules on scientific notation and sig figs. 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