Presentation on theme: "Scientific Notation By the end of class you will be able to express numbers in scientific and decimal notation."— Presentation transcript:
1 Scientific NotationBy the end of class you will be able to express numbers in scientific and decimal notation.
2 How wide is our universe? 210,000,000,000,000,000,000,000 miles(22 zeros)This number is written in decimal notation. When numbers get this large, it is easier to write them in scientific notation.
3 A number is expressed in scientific notation when it is in the form a x 10nwhere a is between 1 and 10and n is an integer
4 Write the width of the universe in scientific notation. 210,000,000,000,000,000,000,000 milesWhere is the decimal point now?After the last zero.Where would you put the decimal to make this number be between 1 and 10?Between the 2 and the 1
5 2.10,000,000,000,000,000,000,000.How many decimal places did you move the decimal?23When the original number is more than 1, the exponent is positive.The answer in scientific notation is2.1 x 1023
6 1) Express 0.0000000902 in scientific notation. Where would the decimal go to make the number be between 1 and 10?9.02The decimal was moved how many places?8When the original number is less than 1, the exponent is negative.9.02 x 10-8
7 Write 28750.9 in scientific notation. x 10-5x 10-4x 104x 105
8 2) Express 1.8 x 10-4 in decimal notation. 3) Express 4.58 x 106 in decimal notation.4,580,000
9 4) Use a calculator to evaluate: 4.5 x 10-5 1.6 x 10-2 TypeYou must include parentheses if you don’t use those buttons!!(4.5 x ) (1.6 x )Write in scientific notation.x 10-3
10 5) Use a calculator to evaluate:. 7. 2 x 10-9. 1 5) Use a calculator to evaluate: x x 102 On the calculator, the answer is:6.E -11The answer in scientific notation is6 xThe answer in decimal notation is
11 6) Use a calculator to evaluate (0. 0042)(330,000) 6) Use a calculator to evaluate (0.0042)(330,000). On the calculator, the answer is1386.The answer in decimal notation is1386The answer in scientific notation is1.386 x 103
12 7) Use a calculator to evaluate (3,600,000,000)(23) 7) Use a calculator to evaluate (3,600,000,000)(23). On the calculator, the answer is:8.28 x 1010The answer in scientific notation is8.28 x 10 10The answer in decimal notation is82,800,000,000
13 Write (2.8 x 103)(5.1 x 10-7) in scientific notation.
14 Write in PROPER scientific notation Write in PROPER scientific notation. (Notice the number is not between 1 and 10) 8) x 1092.346 x 10119) x 104on calculator: 6426.42 x 10 2
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