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CHAPTER4.3T
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1994-02-15
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àï4.3ïScientific Notation
äïPlease write the following numbers in scientific
êênotation.
âS
#êêï2,345,000ë=ë 2.345 x 10æ
#êêè .000781ë=ë 7.81 x 10úÅ
éS
Any number greater than or equal to one but less than 10 is already in
scientific notation.
êêêExamplesï1.35,è6.738,è 9.3425
Numbers greater than or equal to ten can be written in scientific
notation by moving the decimal to the right of the first nonzero digit,
and multiplying by a power of 10.ïThe exponent on the 10 is equal to
the number of places the decimal is moved.
#ë 2,432.0ï=ï2.432 x 10Äêë324.0ï=ï3.24 x 10ì
Numbers between zero and one can be written in scientific notation by
moving the decimal to the right of the first nonzero digit and multi-
plying by a power of 10.ïThe exponent this time is the negative of the
number of places the decimal is moved.
#ë .00134ï=ï1.34 x 10úÄêë .0876ï=ï8.76 x 10úì
1
êë Write 28,400,000 in scientific notation.
#A)ï2.84 x 10Æè B)ï28.4 x 10æë C)ï.284 x 10ôè D) å of ç
ü
#êêêï28,400,000ï=ï2.84 x 10Æ
Ç A
2
êêèWrite 30,000 in scientific notation.
#A)ï30.00 x 10ÄèB)ï.300 x 10Éë C)ï3.00 x 10Åè D) å of ç
ü
#êêêë 30,000ï=ï3.00 x 10Å
Ç C
3
êêèWrite .00081 in scientific notation.
#A)ï.81 x 10úÄè B)ï8.1 x 10úÅë C)ï81 x 10Åë D) å of ç
ü
#êêêë .00081ï=ï8.1 x 10úÅ
Ç B
4
êêèWrite .734 in scientific notation.
#A)ï73.4 x 10úîè B) 73.4 x 10ìêC) 7.34 x 10úîèD) å of ç
ü
#êêêë .734ï=ï7.34 x 10úî
Ç C
äïWrite each number without exponents.
âS
#êï3.2 x 10Éï=ï320,000êè 1.86 x 10úìï=ï.0186
éS
#To write a number such as, 3.2 x 10É, without exponents, move the
decimal to the right five places.
#êêêêë 3.2 x 10É =ï320,000
#To write a number such as, 1.86 x 10úì, without exponents, move the
decimal two places to the left.
#êêêêë 1.86 x 10úìï=ï.0186
5
#êêèWrite 7.83 x 10É without exponents.
A)ï7,830êèB) 783,000êïC) 78,300ê D) å of ç
ü
#êêêè7.83 x 10É =ï783,000
Ç B
6
#êêèWrite 6.21 x 10úÄ without exponents.
A)ï.621êè B) .0621êè C) .00621ê D) å of ç
ü
#êêêè6.21 x 10úÄ =ï.00621
Ç C
7
#êêèWrite 8.324 x 10úÆ without exponents.
A) .0000008324ë B) 83,240,000ë C) .0008324ëD) å of ç
ü
#êêêè6.324 x 10úÆ =ï.0000008324
Ç A
8
#êèMultiplyï(2.3 x 10Ä)(4.1 x 10úî) and write without exponents.
#A) 326êêB) 6.4 x 10ìê C) 943êïD) å of ç
ü
#êè (2.3 x 10Ä)(4.1 x 10úî)ï=ï(2.3 x 4.1)(10Äx 10úî)
#êêêêê =ï9.43 x 10ì
êêêêê =ï943
Ç C
9
#Divide &ë12 x 10Éêêêêêêè å
#writeê ───────êèA) 4 x 10ÆèB) 4,000è C) 400èD)ïof
#withoutê3 x 10ìêêêêêêè ç
exponents.
ü
#êê12 x 10Éë12è 10É
#êê───────è=ï── xï──è=ï4 x 10Äï=ï4,000
#êê 3 x 10ìë 3è 10ì
Ç B
10
#êêêè (3.2 x 10É)(4.1 x 10úÄ)
êêSimplifyè──────────────────────
#êêêè (2 x 10úì)(6.3 x 10æ)
ïA)ï.0104ê B)ï2060ê C)ï.00072ê D)ïå of ç
ü
#êè (3.2 x 10É)(4.1 x 10úÄ)ë(3.2 x 4.1)(10É x 10úÄ)
êè ─────────────────────è=ï──────────────────────
#êè (2 x 10úì)(6.3 x 10æ)ê(2 x 6.3)(10úì x 10æ)
#êï13.12 x 10ìë13.12ë10ì
#ë =ï──────────è=ï─────ïxï──è≈ï1.04 x 10úìè=ï.0104
#êï12.6 x 10Åë 12.6ë 10Å
Ç A