Sample Problem ___________________ have an infinite number of significant figures. 370 crayons or 1km = 1000m A block of aluminum has a mass of 147.3g. A student measures the mass of the block as In general, a answer cannot 138.9g. What is the student’s error? be more precise than the ____________________ measurement from which it was calculated. Addition and Subtraction What is the percent error? When , your answer can only have the same amount of ___________ The in a ___________ as the number with the ___________ measurement include all the digits that are __________, plus a last digit that is . _____________ of decimal places. Rules for Significant Figures Sample Exercise Every digit is significant. Ex: 254 or Calculate the sum of the three measurements. 65.43 Give the answer to the correct number of significant figures. Zeros significant figures are significant. Ex: 3005 or 1.083 12.52 m + 349.0 m + 8.24 m = Zeros (to the left) the significant Practice Exercise figures are not significant. Ex: 0.07902 or 0.6932 Perform each operation. Express your answers Zeros (to the right) the significant to the correct number of significant figures. figures AND after the decimal place are a. 61.2 m + 9.35 m + 8.6 m = significant. Ex: 20.3200 or 63000 b. 34.61 m 17.3 m = – Numbers that can be and _________
Sample Problem A block of aluminum has a mass of 147.3g. A student measures the mass of the block as 138.9g. What is the student’s error? What is the percent error? The in a measurement include all the digits that are __________, plus a last digit that is . Rules for Significant Figures Every digit is significant. Ex: 254 or 65.43 Zeros significant figures are significant. Ex: 3005 or 1.083 Zeros (to the left) the significant figures are not significant. Ex: 0.07902 or 0.6932 Zeros (to the right) the significant figures AND after the decimal place are significant. Ex: 20.3200 or 63000 Numbers that can be and _________ ___________________ have an infinite number of significant figures. 370 crayons or 1km = 1000m In general, a answer cannot be more precise than the ____________________ measurement from which it was calculated. Addition and Subtraction When , your answer can only have the same amount of ___________ ___________ as the number with the ___________ _____________ of decimal places. Sample Exercise Calculate the sum of the three measurements. Give the answer to the correct number of significant figures. 12.52 m + 349.0 m + 8.24 m = Practice Exercise Perform each operation. Express your answers to the correct number of significant figures. a. 61.2 m + 9.35 m + 8.6 m = b. 34.61 m – 17.3 m =
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