Study Guide: Exponents and Scientific Notation
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1 Study Guide: Exponents and Scientific Notation Exponent Rules Multiplying Exponents Description Add exponents with the same base Multiply any coefficient terms Example x! x! = x!" 3! 3! = 3! (3 is the base) 3x! 5x! = 15x!" Raising a Power to a Power Dividing Exponents Multiply the exponents x!! = x!" Subtract the exponents with the same base x!! 2x!! = 2! x!! = 8x!" x! = x! Divide any coefficient terms 18x! 3x! = 6x! Raising a factor to a Power Raise the numerator and the denominator to the power 3x 5! = 3x! 5! = 27x! 125 Negative Exponents When a number is raised to a negative exponent, change the sign of the exponent and use the reciprocal. x!! = 1 x! 1 = x! x!! Zero as an Exponent Any number raised to the 0 power equals 1. 4! = 1 3x! = 1 1
2 Scientific Notation A way to write numbers that are really big or really small. Numbers written as the product of two factors, where one factor is greater than or equal to 1 and less than 10, and the other factor is 10 raised to a power. Converting to Scientific Notation Standard Notation Scientific Notation Explanation 45,000,000 (big number) ! Move the decimal 7 places to the LEFT to make the coefficient between 1 and 10. Raise 10 to a positive power (small number) !! Move the decimal 6 places to the RIGHT to make the coefficient between 1 and 10. Raise 10 to a negative power. Converting to Standard Notation Scientific Notation Standard Notation Explanation ! (big number) 1,550,000 Move the decimal 6 places to the RIGHT. A positive exponent means your number is greater than !! (small number) Move the decimal 5 places to the LEFT. A negative exponent means your number is between 0 and 1. Multiplying and Dividing Scientific Notation à à Multiplying: Multiply the coefficients, add the exponents, and simplify to proper scientific notation. Example: 4 10! 7 10! = 28 10! = ! à à Dividing: Divide the coefficients, subtract the exponents, and simplify to proper scientific notation. Example:!!"!!!"! =!!!"!!"! =!! 10! = ! = 5 10! Adding and Subtracting Scientific Notation Make sure your numbers are the same order of magnitude (raised to the same power of ten) Example: 3 10! ! = 3 10! = 3 10! ! = ! = ! 2
3 Review Questions: Due when you take the test! Simplify 7! 7! 5! 5!! 2x! 5x! 6y! 7y!! x!!! x! y!! 5x!! 3x!!! 3x!" y!"#! 3x! y!! Convert the following terms to proper scientific notation, and then place order them from least to greatest: Scientific Notation Order (1=least, 7=greatest) ! 401,054 10!! 5! 3,546, !! !! ! 3
4 Simplify and put into proper scientific notation 3 10!! 5 10! !! 4 10!!" ! ! ! ! ! ! ! ! ! 4
5 Below are the gross domestic product (GDP) for select countries in the Western Hemisphere. Answer all questions below based on this table. Use calculator to perform your calculations, but show all your work! Country 2012 GDP (in dollars) Brazil !" Ecuador !" Grenada ! Guatemala !" Haiti ! Mexico !" Puerto Rico !! United States !" Venezuela !! a. Name the countries in order from largest GDP to smallest GDP. b. Comparing only GDP, about how many times larger is the United States than Guatemala? c. Again comparing only GDP, about how many times larger is Mexico compared to Haiti? d. Is the GDP of the largest nation larger than all the rest of the nations GDP combined? Show your work. 5
6 Gem and Sydney bought a fish tank that has a volume of 175 liters. The brochure for their tank lists a fun fact that it would take !" tanks of that size to fill all the oceans in the world. Gem and Syd think they can quickly calculate the volume of the oceans using the fun fact and the size of their tank. a. Given that 1 liter = !!" cubic kilometers (measurement of volume), rewrite the size of the tank in cubic kilometers using scientific notation. b. Determine the volume of all the oceans in the world in cubic kilometers using the fun fact. c. Jessica liked Gem and Syd s tank so much she bought her own fish tank that holds an additional 75 liters. Syd asked you to find how many tanks it would take to fill the Pacific Ocean. The Pacific Ocean has a volume of 660,000,000 cubic kilometers. 6
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