a
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Ressource
Out Middle
High
School
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Grade 12 - Exp.
Ressource
Out High
4
3
2
1
Grade 6
/ multiplication
73 exercises (including 72 corrected)
a
Mental Math
(1 exercice)
Review: Addition and Subtraction
(9 exercices)
Introduction multiplication by 0.1; 0.01; 0.001
(2 exercices)
Elementary procedure: multiplication by 0.1; 0.01; 0.001
(5 exercices)
Introduction to decimal multiplication
(4 exercices)
Multiplications of decimal numbers
(9 exercices)
Addition or multiplication of several terms
(4 exercices)
Order of magnitude
(5 exercices)
Addition, subtraction, multiplication
(11 exercices)
Problems
(11 exercices)
Other basic procedures
(2 exercices)
Multiplication by 10, 100, ... and 0.1 , 0.01 , ...
(1 exercice)
Succession of operations
(3 exercices)
Problems with sequence of operations
(4 exercices)
image PNG : /home/_math/_exercice/d1/1537/metapost/01.png
image PNG : /home/_math/_exercice/d10/10885/image/a.png
ChingQuizz
:
7
exercises
a
v
ailable
for
Quizz
assessmen
t
:
1.
Mental
Math
E.11806
Compléter
les
p
oin
tillés
:
a
2
×
8
=
4
×
:
:
:
b
6
×
:
:
:
=
12
×
2
c
8
×
:
:
:
=
2
×
28
d
12
×
3
=
9
×
:
:
:
2.
R
eview
:
A
ddition
and
Subtr
action
E.3567
Cop
y
and
complete
the
follo
wing
calculations
:
a
1
8
4
+
3
8
1
.
.
.
b
5
4
3
1
+
1
8
1
1
.
.
.
.
c
1
7
9
3
+
3
5
1
8
.
.
.
.
E.2757
Cop
y
and
complete
the
follo
wing
calculations
:
a
1
5
1
+
7
.
.
.
6
b
3
5
4
6
+
.
.
.
8
6
2
7
.
E.3566
Cop
y
and
p
erform
the
follo
wing
sub-
tractions
:
a
3
5
2
-
1
7
1
.
.
.
b
3
1
5
4
-
9
4
9
.
.
.
.
E.10748
Using
men
tal
arithmetic,
complete
the
dotted
lines
in
the
calculations
b
elo
w
:
a
23
+
:
:
:
=
40
b
57
+
:
:
:
=
90
c
38
+
:
:
:
=
50
d
54
+
:
:
:
=
80
e
24
+
:
:
:
=
50
f
:
:
:
+
41
=
70
E.9907
Using
men
tal
arithmetic,
complete
the
blanks
in
the
calculations
b
elo
w
:
a
37
+
:
:
:
=
100
b
481
+
:
:
:
=
500
c
158
+
:
:
:
=
200
d
233
+
:
:
:
=
300
e
956
+
:
:
:
=
1000
f
508
+
:
:
:
=
600
E.9904
Place
and
p
erform
the
follo
wing
ad-
ditions
:
a
24.5
+
7.84
+
108.31
b
3.75
+
15.27
+
109.6
E.9900
Cop
y
and
complete
the
follo
wing
calculations
:
a
3
7,
.
1
+
.
3
.
6
2
8
.
,
1
.
b
3
0
4,
.
.
+
.
.
8
.
1
3
6
0
.
,
7
0
E.9909
P
erform
the
follo
wing
subtractions
:
a
23.5
−
10.7
b
54.709
−
35.85
c
307.54
−
184.102
E.7870
Using
men
tal
arithmetic,
complete
the
follo
wing
dots
:
a
3.7
+
:
:
:
=
4
b
2.07
+
:
:
:
=
3
c
8.34
+
:
:
:
=
9
d
1.037
+
:
:
:
=
2
e
5.311
+
:
:
:
=
6
f
19.9
+
:
:
:
=
20
3.
Intr
o
duction
multiplic
ation
by
0.1
;
0.01
;
0.001
E.10315
1
a
What
is
the
v
alue
of
ten
ten
ths?
t
w
elv
e
ten
ths?
b
Complete
the
blanks
b
elo
w
:
10
×
0
;
1
=
:
:
:
;
12
×
0
;
1
=
:
:
:
;
57
×
0
;
1
=
:
:
:
2
a
What
is
the
v
alue
of
one
h
undredths?
of
three
h
un-
dred
and
t
w
en
t
y-fiv
e
h
undredths?
b
Complete
the
blanks
b
elo
w
:
100
×
0
;
01
=
:::
;
325
×
0
;
01
=
:::
;
1503
×
0
;
01
=
:::
h
ttps:/
/c
hingmath.fr
sacados/11806
chapExoCorrec/3567
sacados/3567
chapExoCorrec/2757
sacados/2757
chapExoCorrec/3566
sacados/3566
chapExoCorrec/10748
sacados/10748
chapExoCorrec/9907
sacados/9907
chapExoCorrec/9904
sacados/9904
chapExoCorrec/9900
sacados/9900
chapExoCorrec/9909
sacados/9909
chapExoCorrec/7870
sacados/7870
chapExoCorrec/10315
sacados/10315
Milliers
Millièmes
Cen
taines
Dizaines
Milliers
Cen
taines
Dizaines
Unités
Dixièmes
Cen
tièmes
Millièmes
Dix
Cen
t
100
000
10
000
1
000
100
10
1
0,1
0,01
0,001
0,000
1
0,000
01
E.10793
Consider
the
table
of
units
b
elo
w
:
1
Place
sixt
y-one
thousandths
in
the
table.
Giv
e
the
v
alue
of
:
61
×
0.001
=
:
:
:
2
Place
one
thousand
three
h
undred
sev
en
teen
ten
ths
in
the
table.
Giv
e
the
v
alue
of
:
3117
×
0.1
=
:
:
:
3
Place
fort
y-four
h
undredths
in
the
table.
Giv
e
the
v
alue
of
:
44
×
0.01
=
:
:
:
4
Complete
the
follo
wing
sen
tence
:
ˇ
T
o
m
ultiply
b
y
0.1,
0.01,
0.001,
mo
v
e
the
decimal
p
oin
t
to
the
.
.
.
.
.
.
of
.
.
.
.
.
.
,
.
.
.
.
.
.
,
.
.
.
.
.
.
ranks
ı
4.
Elementary
pr
o
c
e
dur
e
:
multiplic
ation
by
0.1
;
0.01
;
0.001
E.6271
Using
men
tal
arithmetic,
p
erform
the
follo
wing
calculations
:
a
32
×
0.1
b
5.1
×
0.1
c
124
×
0.01
d
89.1
×
0.1
e
431.4
×
0.01
f
8741.4
×
0.001
E.9917
Using
men
tal
arithmetic,
p
erform
the
follo
wing
calculations
:
a
54.2
×
0.01
b
0.002
×
0.1
c
25.45
×
0.001
d
56
×
0.001
e
0.542
×
0.01
f
17
×
0.001
E.1529
The
results
of
the
calculations
b
e-
lo
w
ha
v
e
had
their
commas
remo
v
ed.
Cop
y
these
calculations,
adding
the
correct
comma
to
the
results.
a
153.352
×
0.01
=
153352
b
29.57
×
0.001
=
2957
c
359.576
×
0.1
=
359576
d
56.34
×
0.001
=
5632
E.1542
Complete
the
follo
wing
calculations
correctly
:
a
54.67
×
=
0.5467
b
21.34
×
=
2.134
c
34
×
=
3400
d
982.5
×
=
0.9825
E.9918
Complete
the
follo
wing
equations
correctly
:
a
37.82
×
=
378.2
b
12
×
=
0.12
c
9.698
×
=
9698
d
4.325
×
=
432.5
5.
Intr
o
duction
to
de
cimal
multiplic
ation
E.2282
1
P
erform
the
follo
wing
op
erations
:
a
(3.6
×
10)
×
(7.3
×
10)
b
(4.32
×
100)
×
(9.2
×
10)
2
F
rom
the
previous
question,
deduce
the
results
of
the
follo
wing
calculations
:
a
3.6
×
7.3
b
4.32
×
9.2
E.1538
W
e
giv
e
the
result
of
the
calculation
b
elo
w
:
2
451
×
527
=
1
291
677
Without
p
erforming
the
op
eration,
giv
e
the
result
of
the
fol-
lo
wing
calculations
:
a
24.51
×
527
b
24
510
×
5
270
c
245.1
×
52.7
d
24.51
×
5.27
e
245.1
×
5
270
f
24.51
×
5
270
E.1539
Giv
en
that
2941
×
67
=
197
047
and
without
sho
wing
the
calculation,
giv
e
the
result
of
the
follo
w-
ing
m
ultiplications
:
a
29
;
41
×
6
;
7
b
2
;
941
×
0
;
67
c
2941
×
670
d
0
;
2941
×
6700
E.1526
Kno
wing
that
26
×
344
=
8944
and
without
asking
the
op
eration,
giv
e
the
result
of
eac
h
of
these
m
ultiplications
:
a
2.6
×
344
b
2.6
×
3.44
c
0.026
×
344
d
2.6
×
0.344
e
0.26
×
0.344
6.
Multiplic
ations
of
de
cimal
numb
ers
h
ttps:/
/c
hingmath.fr
chapExoCorrec/10793
sacados/10793
Milliers
Millièmes
Cen
taines
Dizaines
Milliers
Cen
taines
Dizaines
Unités
Dixièmes
Cen
tièmes
Millièmes
Dix
Cen
t
100
000
10
000
1
000
100
10
1
0,1
0,01
0,001
0,000
1
0,000
01
chapExoCorrec/6271
sacados/6271
chapExoCorrec/9917
sacados/9917
chapExoCorrec/1529
sacados/1529
chapExoCorrec/1542
sacados/1542
chapExoCorrec/9918
sacados/9918
chapExoCorrec/2282
sacados/2282
chapExoCorrec/1538
sacados/1538
chapExoCorrec/1539
sacados/1539
chapExoCorrec/1526
sacados/1526
E.1537
Here
is
a
studen
t’s
w
ork.
Cop
y
the
calculations
and
correct
them
if
necessary
:
E.9925
Place
and
p
erform
the
follo
wing
m
ul-
tiplications
:
a
34.1
×
6
b
25
×
0.47
c
156.2
×
67
E.10786
P
erform
the
follo
wing
m
ultiplica-
tions
:
a
3
×
1.2
b
4
×
1.04
c
7
×
2.2
E.1527
Put
and
p
erform
the
follo
wing
m
ul-
tiplications
:
a
0.3
×
0.4
b
8.4
×
2.3
c
3.7
×
9.6
E.9924
Place
and
p
erform
the
follo
wing
m
ul-
tiplications
:
a
37.81
×
60.4
b
25.45
×
3.07
c
435.45
×
32.6
E.9921
Among
the
follo
wing
calculations,
find
the
in
tru
:
a
3.15
×
0.7
b
31.5
×
0.07
c
0.0315
×
70
d
0.00315
×
7
E.10883
Put
and
p
erform
the
follo
wing
m
ul-
tiplications
:
a
15.4
×
3.8
b
8.87
×
2.5
c
19.2
×
3.7
E.9931
Place
and
p
erform
the
follo
wing
m
ul-
tiplications
:
a
0.04
×
295
b
12345
×
2.2
c
92
×
78.47
E.10392
Place
and
p
erform
the
follo
wing
m
ultiplications
:
a
34.1
×
25.3
b
86.3
×
0.97
7.
A
ddition
or
multiplic
ation
of
sever
al
terms
E.1540
Using
men
tal
arithmetic,
p
erform
the
follo
wing
m
ultiplications
:
A
13.1
×
0.5
×
4
b
1.25
×
8
×
7
c
0.25
×
5.1
×
4
d
7.5
×
3
×
2
Hin
t
:
factors
will
b
e
group
ed
together
in
a
clev
er
w
a
y
to
mak
e
calculations
easier.
E.1536
Using
men
tal
arithmetic,
p
erform
the
follo
wing
m
ultiplications
:
a
3.6
×
4
×
2.5
b
0.5
×
3.75
×
20
c
8
×
0.75
×
3
×
4
d
25
×
2.5
×
4
E.2318
Using
men
tal
arithmetic,
p
erform
the
follo
wing
m
ultiplications
:
A
0.1
×
4
×
3.71
×
2.5
b
4
×
2.1
×
2.5
×
3
c
15
×
0.1
×
4
×
3
d
2.4
×
0.2
×
2
×
5
E.9923
Using
men
tal
math,
p
erform
the
follo
wing
op
erations
:
a
13
+
55
+
45
+
77
b
5
×
3
;
76
×
0
;
4
×
0
;
01
8.
Or
der
of
magnitude
E.6615
F
or
eac
h
calculation,
three
answ
ers
are
prop
osed
;
only
one
is
correct.
Giv
e
the
correct
answ
er
in
eac
h
case
:
a
b
c
d
1
32.4
×
74.3
2412.43
243.32
243.33
2407.32
2
561.73
−
235.2
326.53
32.53
325.12
33.82
3
0.98
×
32.4
31.752
31.834
125.242
123.254
Hin
t
:
to
determine
the
correct
answ
er,
w
e
can
use
an
or-
der
of
magnitude
of
the
v
alue
of
the
calculation
but
also
the
prop
erties
of
the
op
erations.
E.3637
F
or
eac
h
calculation
three
answ
ers
are
prop
osed
;
only
one
is
correct.
Giv
e
the
correct
answ
er
in
eac
h
case
:
Resp
onse
a
Resp
onse
b
Resp
onse
c
Resp
onse
d
987.7
×
2.2
217.92
2171.92
2172.94
217.94
387.78+615.1
1002.88
10
002.78
1002.87
10
001.87
152.4
×
3.9
594.36
854.46
412.36
746.66
Hin
t
:
T
o
determine
the
correct
answ
er,
one
can
use
an
or-
der
of
magnitude
of
the
v
alue
of
the
calculation
but
also
the
prop
erties
of
the
op
erations.
h
ttps:/
/c
hingmath.fr
chapExoCorrec/1537
sacados/1537
chapExoCorrec/9925
sacados/9925
chapExoCorrec/10786
sacados/10786
chapExoCorrec/1527
sacados/1527
chapExoCorrec/9924
sacados/9924
chapExoCorrec/9921
sacados/9921
chapExoCorrec/10883
sacados/10883
chapExoCorrec/9931
sacados/9931
chapExoCorrec/10392
sacados/10392
chapExoCorrec/1540
sacados/1540
chapExoCorrec/1536
sacados/1536
chapExoCorrec/2318
sacados/2318
chapExoCorrec/9923
sacados/9923
chapExoCorrec/6615
sacados/6615
chapExoCorrec/3637
sacados/3637
E.1530
F
or
eac
h
question,
giv
e
the
answ
er
corresp
onding
to
the
result
of
the
calculation.
a
53.45
+
345.505
b
47.9
×
102.01
c
134.2
×
0.96
d
75.64
×
1.12
Rép
onse
1
Rép
onse
2
Rép
onse
3
Rép
onse
4
a
399
398.96
398.955
398.91
b
484.352
4743.23
4884.279
473.23
c
142.131
128.832
14.131
14.832
d
84.7168
72.2512
722.2512
842.7168
E.9920
F
or
eac
h
op
eration
b
elo
w,
giv
e
the
asso
ciated
answ
er
in
the
table.
Do
not
p
erform
the
calculation,
use
orders
of
magni-
tude,etc.
.
.
a
108.6
+
35.23
+
415.34
b
314
×
42
×
0.11
c
3783.52
+
84.2
+
285.34
d
3.6
×
5.4
×
2.33
Rép
onse
1
Rép
onse
2
Rép
onse
3
Rép
onse
4
a
561.23
559.17
55.17
56.23
b
145.68
1450.68
1
452.68
1450.64
c
4153.06
415.306
4153.02
415.02
d
45.2952
45.292
45.22
45.2
E.9919
George
go
es
to
the
mark
et
and
buys
4
lots
of
y
ogurt
at
2.80
e
eac
h
and
three
kilos
of
meat
at
12.1
e
=
k
g
.
Giv
e
an
order
of
magnitude
for
George’s
purc
hases.
9.
A
ddition,
subtr
action,
multiplic
ation
E.1532
Install
and
p
erform
the
follo
wing
op
erations
:
a
152.73
−
19.744
b
521.04
×
0.82
E.9927
Install
and
p
erform
the
follo
wing
op
erations
:
a
74.34
−
45.951
b
3.75
×
32.4
E.1541
P
erform
the
follo
wing
calculations
:
A
37.2
×
9.2
b
135.42
−
58.34
c
0.062
×
6.7
d
34.54
+
55.48
E.1525
Install
and
p
erform
the
follo
wing
op
erations
:
a
64.35
+
157.37
b
354.12
×
12
c
465.3
−
94.29
d
2.45
×
5.6
E.9928
Install
and
p
erform
the
follo
wing
op
erations
:
a
31.86
−
22.07
b
4.653
−
3.963
c
117
×
22.9
d
16.74
×
5.01
E.9930
Install
and
p
erform
the
follo
wing
op
erations
:
a
261.64
−
127.68
b
27.24
+
541.35
c
78.5
×
23
d
9.204
×
1.25
E.1531
Install
and
p
erform
the
follo
wing
op
erations
:
a
137.34
+
92.2
+
63.81
b
35.24
×
25.1
E.9926
Install
and
p
erform
the
follo
wing
op
erations
:
a
78.65
+
49.76
+
102.06
b
8.204
×
0.202
E.10345
Install
and
p
erform
the
follo
wing
op
erations
:
a
3.57
+
18.18
b
427.16
−
59.07
c
3.17
×
0.54
E.10349
Install
and
p
erform
the
follo
wing
op
erations
:
a
62.9
+
39.22
b
846.26
−
671.5
c
47.7
×
0.37
E.2317
The
calculations
b
elo
w
ha
v
e
had
some
of
its
digits
and
commas
erased.
Cop
y
and
complete
these
op
erations
:
a
3
.
.
,
.
4
+
2
7
.
1
.
.
2
2
9
2
b
4
5
.
,
0
.
-
.
3
7
.
2
1
9
.
9
1
c
.
,
5
3
×
.
.
1
.
.
2
+
.
.
6
.
,
4
.
.
10.
Pr
oblems
E.9954
Nadine
buys
1.5
k
g
w
orth
of
meat
at
the
neigh
b
orho
o
d
mark
et.
Meat
costs
97.7
$
p
er
kilogram.
What
is
the
price
of
the
meat
purc
hased
b
y
Nadine?
h
ttps:/
/c
hingmath.fr
chapExoCorrec/1530
sacados/1530
chapExoCorrec/9920
sacados/9920
chapExoCorrec/9919
sacados/9919
chapExoCorrec/1532
sacados/1532
chapExoCorrec/9927
sacados/9927
chapExoCorrec/1541
sacados/1541
chapExoCorrec/1525
sacados/1525
chapExoCorrec/9928
sacados/9928
chapExoCorrec/9930
sacados/9930
chapExoCorrec/1531
sacados/1531
chapExoCorrec/9926
sacados/9926
chapExoCorrec/10345
sacados/10345
chapExoCorrec/10349
sacados/10349
chapExoCorrec/2317
sacados/2317
chapExoCorrec/9954
sacados/9954
E.9953
A
kilogram
of
mango
is
7.42
e
.
Edéa
buys
2.4
k
g
of
mango.
What
is
the
price
of
the
mango
es
pur-
c
hased?
E.1543
Stores
Auprès
offer
a
600
g
blo
c
k
of
foie
gras
at
29.2
e
p
er
kilogram.
Giv
e
the
price
of
this
blo
c
k
of
foie
gras?
E.10350
T
o
mak
e
a
cak
e,
Aissata
has
to
go
bac
k
to
the
sup
ermark
et
to
buy
3
egg
and
1.4
k
g
flour.
F
or
this,
she
only
tak
es
a
bill
from
10
e
on
her.
Kno
wing
that
eggs
are
sold
at
0.65
e
eac
h
and
that
flour
is
sold
at
0.35
e
p
er
kilogram,
determine
the
sum
with
whic
h
she
will
return
from
the
sup
ermark
et.
E.9932
The
stores
Auprès
offers
a
600
g
blo
c
k
of
foie
gras
at
29.2
e
p
er
kilogram.
Giv
e
the
price
of
this
blo
c
k
of
foie
gras?
E.10346
A
pro
duce
store
sells
a
v
o
cados
for
2.34
e
eac
h
and
1.30
e
p
er
kilogram
of
green
b
eans.
P
aul
go
es
shopping
at
this
store
with
10
e
in
his
p
o
c
k
et.
He
buys
2
a
v
o
cados
and
600
grams
of
green
b
eans.
Ho
w
m
uc
h
do
es
he
ha
v
e
left
when
he
gets
home?
E.9956
Arth
ur
decides
to
sa
v
e
money
.
He
plans
to
put
2.50
e
p
er
mon
th
in
to
his
piggy
bank.
Giv
e
the
amoun
t
he
will
ha
v
e
sa
v
ed
in
4
y
ears.
E.10884
Aline
retriev
es
an
old
128
M
o
USB
stic
k.
She
deletes
all
the
con
ten
ts
of
the
k
ey
and
places
on
it
:
6
photos,
eac
h
of
whic
h
is
1.4
M
o
,
4
videos,
eac
h
of
whic
h
is
4.6
M
o
.
Ho
w
m
uc
h
free
space
will
this
USB
stic
k
ha
v
e
after
all
these
files
ha
v
e
b
een
placed
on
it?
E.10885
Matthias
w
an
ts
to
mak
e
a
big
pumpkin
soup.
T
o
do
so,
he
needs
:
2.4
kilograms
of
pumpkin
1.5
kilograms
of
p
otato
es.
Here
is
the
information
he
finds
on
the
w
ebsite
of
the
sup
er-
mark
et
near
his
home
:
Starting
with
20
e
at
the
sup
ermark
et,
determine
ho
w
m
uc
h
money
he
will
ha
v
e
left
after
buying
the
pumpkin
and
p
ota-
to
es
for
his
soup.
E.6289
1
Ligh
t
tra
v
els
through
space
with
a
sp
eed
of
300
000
k
m
=
s
and
tak
es
8
min
utes
to
tra
v
el
the
distance
from
the
Sun
to
the
Earth.
Determine
the
measuremen
t
of
the
Earth-Sun
distance.
2
Ligh
t
tak
es
1.3
s
to
tra
v
el
the
distance
Mo
on-Earth.
Giv
e
the
measure
of
this
distance.
E.6581
W
e
consider
the
follo
wing
t
w
o
cal-
culation
programs
:
Program
A
Cho
ose
a
n
um
b
er.
Multiply
it
b
y
3
.
Then
add
2
.
Displa
y
the
result
Program
B
Cho
ose
a
n
um
b
er.
Subtract
1
from
it.
Then
m
ultiply
b
y
2
.
Then
add
6
.
Displa
y
the
result
1
If
the
c
hosen
n
um
b
er
is
4
,
what
are
the
n
um
b
ers
dis-
pla
y
ed
b
y
eac
h
of
these
calculation
programs?
2
If
the
c
hosen
n
um
b
er
is
2
,
what
are
the
n
um
b
ers
dis-
pla
y
ed
b
y
eac
h
of
these
calculation
programs?
11.
Other
b
asic
pr
o
c
e
dur
es
E.7871
Using
men
tal
arithmetic,
p
erform
the
follo
wing
m
ultiplications
:
A
14
×
5
b
32
×
5
c
4
×
25
d
7
×
25
e
4
×
50
f
19
×
50
E.7872
Using
men
tal
arithmetic,
p
erform
the
follo
wing
m
ultiplications
:
a
12
×
0.5
b
37
×
0.5
c
6.6
×
0.5
d
40
×
0.5
e
61
×
0.5
f
1.4
×
0.5
12.
Multiplic
ation
by
10,
100,
...
and
0.1
,
0.01
,
...
E.10886
P
erform
the
follo
wing
calculations
:
a
14.5
×
0.01
b
35.9
×
100
c
0.032
×
0.01
13.
Suc
c
ession
of
op
er
ations
h
ttps:/
/c
hingmath.fr
chapExoCorrec/9953
sacados/9953
chapExoCorrec/1543
sacados/1543
chapExoCorrec/10350
sacados/10350
chapExoCorrec/9932
sacados/9932
chapExoCorrec/10346
sacados/10346
chapExoCorrec/9956
sacados/9956
chapExoCorrec/10884
sacados/10884
chapExoCorrec/10885
sacados/10885
chapExoCorrec/6289
sacados/6289
chapExoCorrec/6581
sacados/6581
chapExoCorrec/7871
sacados/7871
chapExoCorrec/7872
sacados/7872
chapExoCorrec/10886
sacados/10886
q
b
5
a
a
A
=
1
+
(3
×
=
1
+
=
b
B
=
(5
×
+
(3
×
=
+
=
c
C
=
2
+
(2
×
×
3
=
2
+
×
3
=
×
3
=
d
D
=
25
−
2
×
(2+3)
=
25
−
2
×
=
25
−
=
E.7886
Metho
d
:
When
a
calculation
in
v
olv
es
sev
eral
op
erations,
it
m
ust
b
e
written
out
step
b
y
step
in
order
to
:
k
eep
trac
k
of
the
v
alue
of
the
calculation
at
all
times,
sho
w
eac
h
step
of
the
reasoning.
This
video
presen
ts
a
ˇ
calculation
metho
d
ı
to
b
e
used
as
an
example
for
all
questions
in
this
exercise
P
erform
the
follo
wing
op
erations,
resp
ecting
the
order
of
op-
erations
:
a
2
×
4
+
5
×
6
b
2
×
4
+
5
×
3
c
2
×
4
+
5
×
6
d
2
×
4
+
5
×
6
E.7894
Complete
the
blanks
to
ˇ
driv
e
ı
y
our
calculations
to
the
result
:
E.5598
P
erform
the
calculations
b
elo
w,
ob-
serving
the
priorit
y
of
the
paren
theses
:
a
15
−
(2
×
3)
b
(5
−
2)
×
11
c
(11
−
9)
×
(9
+
5)
d
3
×
(2
+
4)
14.
Pr
oblems
with
se
quenc
e
of
op
er
ations
E.1533
1
Bruno
go
es
to
the
Halles
mark
et
with
a
tic
k
et
from
5
e
.
He
buys
520
g
of
stra
wb
erries
at
3.14
e
p
er
kg.
Determine
the
amoun
t
Bruno
go
es
home
with.
Directions
:
w
e
will
use
the
v
alue
appro
ximated
b
y
excess
of
the
price
of
the
stra
wb
erries
to
the
nearest
cen
t.
2
Whic
h
expression
directly
answ
ers
the
previous
question?
a
0.52
×
3.14
−
5
b
5
−
0.52
×
3.14
c
520
×
3.14
−
5
d
5
−
520
×
3.14
E.6318
1
a
Jeanne
w
an
ts
to
surround
her
v
egetable
garden
with
a
wire
mesh
to
protect
her
v
egetables
from
small
ro-
den
ts.
Going
online,
she
finds
a
wire
mesh
fence
cost-
ing
2.1
e
=
m
.
She
measures
around
her
v
egetable
garden
and
gets
a
p
erimeter
of
4.7
m
.
Ho
w
m
uc
h
is
it
going
to
cost
her
to
buy
the
fence?
b
Since
her
v
egetable
garden
is
rectangular
in
shap
e,
she
w
an
ts
to
add
a
p
ost
to
the
four
corners
of
the
garden.
These
p
osts
ha
v
e
a
unit
price
of
0.6
e
.
What
is
the
total
price
of
this
fence?
2
What
expression
is
used
to
obtain
the
total
price
of
this
fence?
a
2.1
+
4.7
+
4
+
0.6
b
2.1
×
4
+
0.6
×
4.7
c
4.7
+
4
×
2.1
+
0.6
d
2.1
×
4.7
+
0.6
×
4
E.5599
1
Otapi
is
a
magazine
for
teens
that
app
ears
22
times
a
y
ear
at
a
price
of
4.95
e
p
er
cop
y
.
The
magazine
offers
19.10
e
off
an
y
one-y
ear
subscrip-
tion.
What
is
the
subscription
price
for
1
y
ear?
2
Whic
h
of
the
expressions
b
elo
w
giv
es
the
price
of
the
1-y
ear
subscription?
a
19.10
−
4.95
×
22
b
4.95
×
22
−
19.10
c
19.10
−
4.95
×
22
d
19.10
+
4.95
+
22
E.1534
Martine
go
es
to
the
mark
et
with
a
20
e
.
bill
She
buys
only
2.4
kilos
of
p
ears.
The
price
of
p
ears
b
eing
3.2
e
p
er
kilo.
1
W
rite
an
expression
using
paren
theses
to
determine
ho
w
m
uc
h
money
he
has
left
when
he
exits
the
mark
et.
2
P
erform
this
calculation.
15.
Unclassifie
d
exer
cises
E.9933
Emily
go
es
do
wn
to
wn
with
150
e
to
shop
during
the
sale
p
erio
d.
She
buys
a
pair
of
pan
ts
for
45.50
e
and
a
sw
eater
for
27.60
e
.
Ho
w
m
uc
h
money
do
es
he
ha
v
e
left
when
he
gets
bac
k
from
his
shopping?
E.9955
F
rançois
decides
to
fill
25
b
ottles
of
15
c‘
with
a
p
erfume.
Kno
wing
that
a
liter
of
this
p
erfume
costs
35
$.
1
Ho
w
man
y
b
ottles
of
1
‘
p
erfume,
do
es
F
rancis,
need
to
buy?
2
What
is
the
total
purc
hase
price
of
the
p
erfume?
h
ttps:/
/c
hingmath.fr
chapExoCorrec/7886
sacados/7886
q
b
5
a
chapExoCorrec/7894
sacados/7894
fichierPlus/7894/
a
A
=
1
+
(3
×
=
1
+
=
b
B
=
(5
×
+
(3
×
=
+
=
c
C
=
2
+
(2
×
×
3
=
2
+
×
3
=
×
3
=
d
D
=
25
−
2
×
(2+3)
=
25
−
2
×
=
25
−
=
chapExoCorrec/5598
sacados/5598
chapExoCorrec/1533
sacados/1533
chapExoCorrec/6318
sacados/6318
chapExoCorrec/5599
sacados/5599
chapExoCorrec/1534
sacados/1534
chapExoCorrec/9933
sacados/9933
chapExoCorrec/9955
sacados/9955
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