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chapter8.5b
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1994-01-28
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à 8.5 The Order of Operations On Rational Numbers
äïPlease simplify the following expressions using the
correct Order of Operations.
#âêêï-3 ∙ 5ì - 2 ∙ ( 5 - 9 ) - 2
#êêêè-3 ∙ 5ì - 2 ∙ ( -4 ) - 2
êêêè-3 ∙ 25 - 2 ∙ ( -4 ) - 2
êêêê -75 - (-8) - 2
êêêêï-75 + 8 - 2
êêêêè -67 - 2
êêêêë -69
#éSèIn order to simplify the expression, -3 ∙ 5ì - 2 ∙ ( 5 - 9)-2,
it is necessary to agree on the following order of operations:
êêï1)ïPerform operations in parençs first.
êêï2)ïSimplify exponents.
êêï3)ïPerform multiplication and division first come
êêë first serve from left to right.
êêï4)ïPerform addition and subtraction first come first
êêë serve from left to right.
(Note that division can come before multiplication if it occurs further
to the left).
#êêê -3 ∙ 5ì - 2 ∙ ( 5 - 9 ) - 2
First, perform the operation in the parençs.
#êêê-3 ∙ 5ì - 2 ∙ ( 5 + (-9)) - 2
#êêêï-3 ∙ 5ì - 2 ∙ ( -4 ) - 2
Next, simplify the exponent.
êêê -3 ∙ 25 - 2 ∙ ( -4 ) - 2
Then perform the multiplication from left to right.
êêêë -75 - (-8) - 2
Finally, perform the subtraction from left to right.
êêêê-75 + 8 - 2
êêêêï-67 - 2
êêêêï-67 + (-2)
êêêêë-69
ï1
êêêïSimplify,è4 - 10 ÷ 2.
êA)ï2êëB)ï-1êè C)ï4êëD)ïå
ü
êêè1) First divide.ê 4 - 10 ÷ 2
êêè2) Then subtract.êè4 - 5
êêêêêê 4 + (-5)
êêêêêêè-1
ÇïB
ï2
êêêïSimplify,è-18 ÷ 2 + 5.
êA)ï6êëB)ï5êëC)ï-4êè D)ïå
ü
êêï1) First divide.ê -18 ÷ 2 + 5
êêï2) Then add.êê -9 + 5
êêêêêêè-4
ÇïC
ï3
êêêïSimplify,è6 + (-9) + 4
êA)ï1êëB)ï2êëC)ï-5êè D)ïå
ü
ë 1) First add.êè6 + (-9) + 4
ë 2) Then add again.êï-3 + 4
êêêêê 1
ÇïA
ï4
#êêêëSimplify,è8 - 3Ä.
êA)ï-5êè B)ï6êëC)ï-19êèD)ïå
ü
#ë 1) Exponent first.êï8 - 3Ä
ë 2) Then subtract.êè8 - 27
êêêêè 8 + (-27)
êêêêê-19
ÇïC
ï5
êêë Simplify,è3 ∙ ( 6 - 10 ) - 3.
êA)ï12êè B)ï-15êèC)ï-6êè D)ïå
ü
ë 1) Parençs first.ë3 ∙ ( 6 - 10 ) - 3
êêêêè3 ∙ ( 6 + (-10)) - 3
ë 2) Multiplication.êè 3 ∙ (-4) - 3
ë 3) Then subtraction.êè - 12 - 3
êêêêêï-12 + (-3)
êêêêêë-15
Ç B
ï6
êêêïSimplify,è5 - (-4) - 6.
êA)ï3êëB)ï-9êè C)ï18êè D)ïå
ü
ë 1) First subtraction.ê5 - (-4) - 6
êêêêê5 + 4 - 6
ë 2) Then subtractionêë9 - 6
êïagain.êêê9 + (-6)
êêêêêè 3
Ç A
ï7
êêêïSimplify,è12 ÷ 6 ∙ 2.
êA)ï4êëB)ï6êëC)ï12êè D)ïå
ü
ë 1) First divide.êë12 ÷ 6 ∙ 2
ë 2) Then multiply.êê2 ∙ 2
êêêêêè 4
Ç A
ï8
êêêèSimplify,è4 ∙ 8 ÷ 16.
êA)ï8êëB)ï12êè C)ï2êëD)ïå
ü
ë 1) First multiply.êè4 ∙ 8 ÷ 16
ë 2) Then divide.êê 32 ÷ 16
êêêêêè 2
Ç C
ï9
êêë Simplify,è12 ÷ 3 ∙ 8 + 6 - 5.
êA)ï16êè B)ï33êè C)ï24êè D)ïå
ü
ë 1) First divide.êë12 ÷ 3 ∙ 8 + 6 - 5
ë 2) Then multiply.êê4 ∙ 8 + 6 - 5
ë 3) Then add.êêê32 + 6 - 5
ë 4) Finally, subtract.êê38 - 5
êêêêêë 38 + (-5)
êêêêêêï33
Ç B
ï10
#êêêïSimplify,è3 ∙ ( 6 - 2 )ì.
êA)ï36êè B)ï24êè C)ï48êè D)ïå
ü
#ë 1) First subtract.êè3 ∙ ( 6 - 2 )ì
#êêêêë3 ∙ ( 6 + (-2))ì
#ë 2) Then the exponent.êï3 ∙ ( 4 )ì
ë 3) Finally, multiply.êè3 ∙ 16
êêêêêè 48
Ç C
ï11
#êêïSimplify,è5 ∙ 2ì + 3 ∙ ( 4 + 1 ) - 17.
êA)ï18êè B)ï22êè C)ï-6êè D)ïå
ü
#ë 1) First parençs.ë 5 ∙ 2ì + 3 ∙ ( 4 + 1 ) - 17
#ë 2) Then exponent.êë 5 ∙ 2ì + 3 ∙ 5 - 17
ë 3) Then multiplication.ê 5 ∙ 4 + 3 ∙ 5 - 17
ë 4) Then addition.êêè20 + 15 - 17
ë 5) Finally, subtraction.êë 35 - 17
êêêêêê35 + (-17)
êêêêêêè18
Ç A
ï12
#êêSimplify,è18 - 4 ∙ 8 + 3ì - (-16) ÷ (-8).
êA)ï14êè B)ï-7êè C)ï-16êèD)ïå
ü
#ë 1) First the exponent.ë18 - 4 ∙ 8 + 3ì - (-16) ÷ (-8)
ë 2) Then multiplication.ë18 - 4 ∙ 8 + 9 - (-16) ÷ (-8)
ë 3) Then division.êë 18 - 32 + 9 - (-16) ÷ (-8)
ë 4) Then subtraction.êë 18 - 32 + 9 - 2
êêêêêè18 + (-32) + 9 - 2
ë 5) Then addition.êêë-14 + 9 - 2
ë 6) Finally, subtraction.êê -5 - 2
êêêêêêï-5 + (-2)
êêêêêêë-7
Ç B