scientific notation remember how?. the coefficient must be greater than or equal to 1 and less than...
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Scientific NotationRemember how?
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The coefficient must be greater than or equal to 1 and less than 10.
Must be base 10 The exponent shows the number of places the
decimal must be moved to change the coefficient to a standard number
A standard number exists when the exponent is zero (0)
Rules of Scientific Notation
4.23 x 105
coefficient base exponent
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These are all BAD EXAMPLES of scientific notation. DON’T DO THESE!!
BAD EXAMPLES
Example Why it’s incorrect
Corrected
0.34 x 107 Coefficient is not between 1 and 10
3.4 x 106
25 x 10 -5 Coefficient is not between 1 and 10
2.5 x 10-4
4.74 x 28 Not base 10(we won’t be solving for these)
4.74 x 256 = 1213.44 = 1.21344 x 103
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When going from scientific notation to standard, do the following If the exponent is POSITIVE, move the decimal
RIGHT Add place-holder zeroes as needed EX: 3.67 x 105 367000
If the exponent is NEGATIVE, move the decimal LEFT Add place-holder zeroes as needed EX: 7.25 x 10-3 0.00725
Scientific Notation Standard
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Write 1.69 x 104 as a standard number
Example
1 6 9 0 0 x 10 4
3210
Once you get to 100, you’re at the standard number. When recording an answer, DO NOT put the 100. Leave it out. Remember: x100 means x1
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Write 4.23 x 10-3 as a standard number
Example
0 0 0 4 2 3 x 10 -3
-2-10
Once you get to 100, you’re at the standard number. When recording an answer, DO NOT put the 100. Leave it out. Remember: x100 means x1Also, for neatness, it’s best to include the leading zero before the decimal.
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When going from standard to scientific notation, do the opposite as before, so: If you move the decimal LEFT, the exponent is
POSITIVE EX: 8976 8.976 x 103
If you move the decimal RIGHT, the exponent is NEGATIVE EX: 0.00058 5.8 x 10-4
Standard Scientific Notation
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Write 780374.2 in scientific notation.
Example
7 8 0 3 7 4 2 x 10
012345
7. Is a number between 1 and 10. We needed to move the decimal 5 times to the left, so the exponent became 105.
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Write 0.006235 in scientific notation.
Example
0 0 0 6 2 3 5 x 10
0-1-2-3
6 is a number between 1 and 10. We needed to move the decimal 3 times to the right, so the exponent became 10-3. Get rid of any leading zeroes.
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Example: 3.2 x 104 x 8.7 x 105
Rules: MULTIPLY the coefficients together like usual
3.2 x 8.7 = 27.84 ADD the exponents together
104 x 105 = 109
Readjust for proper scientific notation, if needed 27.84 x 109 2.784 x 1010
Multiplying in Scientific Notation
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Multiplication Practice Problems
Problem Work Temp Answer
FINAL Answer
4.8 x 103 • 2.3 x 1012
4.8 • 2.3 = 11.04103 • 1012 = 10(3 + 12) = 1015
11.04 x 1015
Can’t leave 11
1.104 x 1016
3.6 x 10-4 • 2.1 x 103
3.6 • 2.1 = 7.5610-4 • 103 = 10(-4 +
3)=10-1
7.56 x 10-1
The 7 is ok7.56 x 10-1
2.65 x 10-5 • 7.3 x 10-7
2.65 • 7.3 = 19.34510-5 • 10-7 = 10(-5 + -7) = 10-12
19.345 x10-12
Can’t leave 19
1.9345 x 10-
11
9.56 x 106 • 9.8 x 10-4
9.56 • 9.8 = 93.688106 • 10-4 = 10(6 + -4) = 102
93.688 x102
Can’t leave 93
9.3688 x 103
2.1 x 103 • 7.22 x 10-19
2.1 • 7.22 = 15.162103 • 10-19 = 10(3 + -
19)= 10-16
15.162 x10-16
Can’t leave 15
1.5162 x 10-
15
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Example: DIVIDE the coefficients like usual (top divided by
bottom)
SUBTRACT the exponents (top # – bottom #)
Readjust for proper scientific notation, if needed 0.573 x 104 5.73 x 103
Dividing in Scientific Notation
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Division Practice Problems
Problem Work (coeff)
Work (exp)
Temp Answer
FINAL Answer
1.36 x 10-5 1.36 x 10-5
0.815 x 104 8.15 x 103
0.385 x 10-1 3.85 x 10-2
1.51 x 103 1.51 x 103
0.488 x 1016 4.88 x 1015
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Metric units have assigned values. When calculating with those values, replace the unit with its value, then solve.
The values are NOT the same as the ones for the factor label conversions This is because they are absolute values, not
comparisons to the base unit.
Scientific Method with Units
Unit Value Sample Equivalent (Scientific)
Equivalent (Standard)
kilo- 103 6.27 kg 6.27 x 103 g 6270 g
mega- 106 2.3 MHz 2.3 x 106 Hz 2300 000 Hz
nano- 10-9 7.4 nm 7.4 x 10-9 m 0.000 000 007 4 m
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Practice Problems with Units
Problem Equivalent Work (coeff)
Work (exp) Answer
12 x 103 1.2 x 104 g
4.42 x 10-3
m(or 4.42 mm)
2.3 ks • 16 s 16 2.3 • 16 = 36.8
103 • 100 = 103
36.8 x 103 3.68 x 104
0.4 kHz • 98 mHz
0.4 x 103 • 98 x 10-3
0.4 • 98 = 39.2
103 • 10-3 = 100
39.2 x 100 3.92 x 101 Hz