Scientific Notation 1. Move the decimal so that there is only
one non zero number in front of it 5,050,000,000
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Scientific Notation 1. Move the decimal so that there is only
one non zero number in front of it 5,050,000,000 5.050000000
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Scientific Notation 1.Move the decimal so that there is only
one non zero number in front of it 2.Count how many places the
decimal had to move 5.050000000 9
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Scientific Notation 1.Move the decimal so that there is only
one non zero number in front of it 2.Count how many places the
decimal had to move 3.This number now becomes the exponent in the
scientific notation. If the decimal moved to the left the exponent
is positive, if it moved to the right the exponent is negative.
5.05 x 10 9
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5,050,000,000 5.05 x 10 9 Equals They are the same number
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Try a really small number 0.0000000122 Write this number in
scientific notation.
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Try a really small number 0.0000000122 1.22
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The decimal moved left how many spaces? 0.00000001.22 Write
this number as the exponent. 8 1.22 x 10 -8
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Significant Figures
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Sig Figs answer the question of How many places should I round
to? or How many decimals do I keep?
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Accuracy how close a measurement is to the true value of the
quantity measured Precision the exactness of a measurement
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The number of sig figs you keep in an answer totally depends on
the precision and accuracy of the instruments you are using.
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Rules to find Sig Figs 1.If the Number is not a zero it is
significant 2.If zeros are in between two non zero numbers it is
significant 3.Zeros before a non zero number are not significant.
4. Zeros after non zero numbers are significant only if there is a
decimal.
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352 4505 0.00324 1240 130.0
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When Multiplying/Dividing keep the smallest number of sig figs
in the answer. When Adding/Subtracting keep the smallest number of
decimals in the answer.
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Dimensional Analysis: A mathematical tool used to convert from
one type of unit to another type of unit
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Situation: Situation: You need to change $50 dollars into
nickels. How many nickels do you need ???
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We need a plan of attack! 1. Write down what we are given $50
dollars
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We need a plan of attack! 1. Write down what we are given 2.
Find a common ratio $1 dollar = 20 nickels
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1. Write down what we are given 2. Find a common ratio $1
dollar = 20 nickels We need a plan of attack! 3. Place the ratio in
the chart so that unit that is in the given is on the bottom
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$50 dollars 20 nickels $1 dollar
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1. Write down what we are given 2. Find a common ratio $1
dollar = 20 nickels We need a plan of attack! 3. Place the ratio in
the chart so that unit that is in the given is on the bottom 4.
Simplify!!!
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$50 dollars 20 nickels $1 dollar Simplify means cancel out
units and do the math. On top multiply on bottom divide 1000
nickels