8th Grade Summer Math Packet Worksheet - Khan Academy, 2014 Page 8
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21T
T
:
O
O
OPIC
HREE
RDER
O F
PERATIONS
When
y ou
h ave
a
n umber
s entence
t hat
c ontains
s everal
o perations,
y ou
u se
t he
o rder
o f
operations
t o
k now
w hich
o peration
m ust
b e
c ompleted
f irst.
1. Do
a ll
o perations
w ithin
p arentheses
f irst.
T his
i s
c alled
“ clearing
p arentheses.”
2. Perform
a ll
o perations
t hat
i nvolve
e xponents
n ext.
3. Do
m ultiplication
a nd
d ivision
i n
t he
o rder
t hat
t hey
a ppear
f rom
l eft
t o
r ight.
T here
i s
no
r ule
t hat
m ultiplication
c omes
b efore
d ivision.
T hese
t wo
a re
o n
t he
s ame
l evel.
Y ou
have
t o
m ake
s ure
y ou
w ork
f rom
l eft
t o
r ight.
4. Do
a ddition
a nd
s ubtraction
i n
t he
o rder
t hat
t hey
a ppear
f rom
l eft
t o
r ight.
A gain,
these
t o
a re
o n
t he
s ame
l evel.
W e
d on’t
a dd
b efore
w e
s ubtract
–
w e
d o
w hichever
o f
t he
two
c omes
f irst,
w hen
r eading
f rom
l eft
t o
r ight.
Y ou
h ave
t o
m ake
s ure
t o
w ork
f rom
l eft
to
r ight.
2
g
Example: 8
3
5
3 4 6
(
)
÷
+ −
− +
:
1.
4
8 3
+
3
4.
÷
5
56 7
+
2.
4
800 2
50
÷
+
5.
2
(26 17)
35
−
+
3.
2
3
6(7
2 )
−
6.
2
80 (20 10)
÷
÷
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