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Scientific Notation and Graphing

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Scientific Notation Use to express very large or small numbers or 6.02x10 23 or 4.35x10 -19

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Scientific Notation Scientific (Exponential) notation is a system in which a number is expressed as a product of a number between 1 and 9 multiplied by 10 raised to a power (exponent).

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Scientific Notation C x 10 n C= the coefficient= only the significant figures are used n= the exponent (power)= location of the decimal point

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Scientific Notation 1. The value of the exponent is determined by counting the number of places the original decimal point must be moved to give the coefficient. Remember that the coefficient must be a number from 1 to 9.

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Scientific Notation 2. If the original number (in standard notation)is greater than 1, the exponent is a positive number or 6.02x If the original number is less than 1, the exponent is a negative number or 4.35x10 -19

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Example 1 Write 628,000 in scientific notation a. Determine the number of sig figs __ 3 b. Write the coefficient ____ 6.28 c.Determine the number of places to move the decimal point __ larger than 1 = positive exponent 5 Answer = 6.28 x 10 5

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Example 2 Write in scientific notation a. Determine the number of sig figs __ 3 b. Write the coefficient ____ 2.60 c. Determine the number of places to move the decimal point __ smaller than 1 = negative exponent 3 Answer = 2.60 x 10 -3

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Write the Following in Scientific Notation a x 10 3 b.3,000,000 3 x 10 6 c x 10 2 d x e x 10 2 f x g or 3.57 x 10 0

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Scientific Notation To convert from scientific notation back to standard (ordinary) notation: Simply move the decimal point the number of places indicated by the exponent. Positive exponent= make number larger Move decimal to the right Negative exponent= make number smaller Move decimal to the left

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Write the Following in Standard Notation a. 3.4 x b x c x d. 6.5 x e. 5 x ,000,000

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Graphing

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a. Circle graph (also called pie chart) Used to show parts of a fixed whole. Usually parts are labeled as percents with the circle representing 100%.

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Graphing b. Bar graph- good for showing quantitative data or data that you can count at exact intervals Ex. Rain fall total each month

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Graphing Line graph- good for showing relationship between two variables Independent variable is plotted on the X axis Dependent variable is plotted on the Y axis Best fit line is drawn so that as many points fall above the line as below

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Graphing Directly related Positive slope As X increases, Y increases

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Graphing Inversely related Negative slope As X value increases, Y decreases

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