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**Scientific Notation A short-hand way of writing large numbers without**

writing all of the zeros. ***A number is in scientific notation if the first factor is greater than or equal to 1 and less than 10 and the second factor is a power of 10. Example(s): 1 x x x 10-6

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**The Distance From the Sun to the Earth**

93,000,000

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**Step 1 93,000,000 = 9.3000000 Move decimal left**

Leave only one number in front of decimal 93,000,000 =

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Step 2 Write number without zeros 93,000,000 = 9.3

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**Step 3 7 93,000,000 = 9.3 x 10 Count how many places you moved decimal**

Make that your power of ten 93,000,000 = 9.3 x 10 7

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**The power of ten is 7 because the decimal moved 7 places. 7**

93,000,000 = 9.3 x 10 7

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93,000, Standard Form 9.3 x Scientific Notation

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**Practice Problem -----> -----> -----> ----->**

Write in scientific notation. Decide the power of ten. 98,500,000 = 9.85 x 10? 64,100,000,000 = 6.41 x 10? 279,000,000 = 2.79 x 10? 4,200,000 = 4.2 x 10? 9.85 x 107 -----> 6.41 x 1010 -----> 2.79 x 108 -----> -----> 4.2 x 106

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**More Practice Problems**

On these, decide where the decimal will be moved. 734,000,000 = ______ x 108 870,000,000,000 = ______x 1011 90,000,000,000 = _____ x 1010 Answers 3) 9 x 1010 7.34 x 108 2) 8.7 x 1011

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**Complete Practice Problems**

Write in scientific notation. 50,000 7,200,000 802,000,000,000 Answers 1) 5 x 104 2) 7.2 x 106 3) 8.02 x 1011

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**Scientific Notation to Standard Form**

Move the decimal to the right 3.4 x 105 in scientific notation move the decimal ---> 340,000 in standard form

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**Move the decimal to the right.**

Write in Standard Form Move the decimal to the right. 6.27 x 106 9.01 x 104 6,270,000 90,100

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