Unformatted text preview: Name: ___________________________________ CH101 Significant Figures – Study Guide section 1.7 in the textbook An exact number is _______________________________________ An example of an exact number is _______________. What are significant figures? Why are significant figures important in science? Rules for Significant Figures 1. The digits 1, 2, 3, 4, 5, 6, 7, 8, 9 are always ______________________. 2. Leading zeros are ________________ significant. 3. Interior zeros are always _________________________. 4. Trailing zeros are ___________ significant unless _____________________________________. How many significant figures are in each of the following measured quantities? 68 cm ________ sig. figs 186,000 kg ________ sig. figs 1005 in ________ sig. figs 2007780 mL ________ sig. figs 0.0596 ft ________ sig. figs 0.0045020 lb ________ sig. figs When multiplying or dividing measured quantities, what determines the number of significant figures in the result? example: 1.075 x 10.074 x 0.48 = ______ (ans. 5.2) When adding or subtracting measured quantities, what determines the number of significant figures in the result? Watch video tutorial on Blackboard examples: 1.352 + 0.08 + 12.4471 = ______ (ans. 13.88) (9.9 x 104) + (4.88 x 102) + (7.60 x 103) = ______ (ans. 1.07 x 105) Rounding Numbers If the first digit to be dropped is 5 or greater, increase the value of the last retained digit by one (rounding up). If the first digit to be dropped is less than 5, the last retained digit is unchanged (rounding down). examples: 36.7135 rounded to two significant figures is 37 (rounded up) 36.7135 rounded to four significant figures is 36.71 (rounded down) Explain the difference between accuracy and precision. End of Chapter Practice Problems Tro First Edition: #69, 71, 75, 77, 79 Tro second Edition: #75, 77, 81, 83, 85, 87 answers are located in Appendix III of the textbook Take the Quiz on Blackboard 2 ...
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 Spring '11
 byrns
 Math

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