Test PracticeT
C 45. CHALLENGE Convert the numbers in each expression to scientific
notation. Then evaluate the expression. Express in scientific notation
and in decimal notation.a.(420,000)(0.015)
__0.025 b.
(0.078)(8.5)
__
0.16(250,000)- REASONING Which is a better estimate for the number of times per year
that a person blinks: 6.25 × 10 –^2 times or 6.25 × 106 times? Explain your
reasoning. - OPEN ENDED Describe a real-world value or measure using numbers in
scientific notation and in standard form. - E WRITE MATH Explain when scientific notation should be used.
Lesson 4C Monomials 189- Which shows 0.00000029 in scientific
notation?
A. 2.9 × 107
B. 2.9 × 106
C. 2.9 × 10 -^6
D. 2.9 × 10 -^7
50. The average width of a strand of thread
is 2.2 × 10 -^4 meter. Which expression
represents this number in standard
form?
F. 22,000 meters
G. 220,000 meters
H. 0.00022 meter
I. 0.000022 meter
Scientific Notation
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AboutAbout
You have used scientific notation to express numbers as the products
of a factor and a power of 10. For example, 487,000,000,000 can be
written as 4.87 × 1011.
Numbers expressed in scientific notation appear
differently on a calculator screen. The screen at the right
shows a calculator display for 4.87 × 1011. The number
following E indicates the exponent that should be used for
the power of 10.Write each calculator screen expression as it would appear in
scientific notation. Then write the value in standard form.- 5.21E 4 52. 8.53E 8
- 9.2E- 2 54. 6.53E- 4
176_189_C3L4_895130.indd 189 12/31/09 12:50 PM