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Significant Digits or "Sig Figs" Rules1. All ______________ digits are significant.143 has ___ sig figs1,276 has ___ sig figs2. ZerosLeading Zeros - ____________________ significant0.000067Middle Zeros - ______________________ significant101Trailing Zeros - ________________________ significant(Depends on a __________ _________) If decimal point is present: they ______significant If decimal point is not present: they ______ significantPractice: How many sig figs are in each number?23.50 ______3. 5280 ____402 _______4. 0.080 ____~~~~~~~~~~~Memory Trick - The USA~~~~~~~~~~~~~~~303847545085AtlanticStart on the right and stop at the first non-zero number. 3500That # and everything after is significant!___ sig figs00AtlanticStart on the right and stop at the first non-zero number. 3500That # and everything after is significant!___ sig figs1841550800PACIFICStart at the left and stop at the first non-zero number. 0.03560That # and everything after is significant!___ sig figs00PACIFICStart at the left and stop at the first non-zero number. 0.03560That # and everything after is significant!___ sig figs120332510223500Calculations using significant digits:Multiplication and Division:Your answer should be equal to the number of significant digits in the ______ accurate factor.this is the one with the _________ sig figsEX:Addition and Subtraction:Your answer should be simplified according to number with the ______________________________.EX:*When performing calculations, you should do the calculation using all the digits allowed by the calculator and round off only at the ______ of the problem. Rounding in the middle can introduce errors.Practice:1. (15.30 g) ÷ (6.4 mL) =3. (12000) x (1.53) =2. 18.9 g4. 1.942 - 0.84 g + 26.9327495503492500749303492500 ................
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