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N
u
m
b
e
r
(
a
d
d
/
s
u
b
)
S
i
n
g
l
e
d
i
g
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a
d
d
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a
n
d
s
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b
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a
c
t
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n
A
d
d
i
t
i
o
n
f
a
c
t
f
a
m
i
l
i
e
s
(
a
+
b
=
c
,
c
-
b
=
a
)
F
a
c
t
F
a
m
i
l
i
e
s
(
I
n
v
e
s
t
i
g
a
t
i
o
n
)
R
e
p
r
e
s
e
n
t
a
t
i
o
n
o
f
a
d
d
/
s
u
b
u
s
i
n
g
o
b
j
e
c
t
s
S
t
r
a
t
e
g
y
-
B
r
i
d
g
e
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o
1
0
(
s
i
n
g
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e
a
n
d
t
w
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d
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g
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)
S
t
r
a
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g
y
-
C
o
m
p
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n
s
a
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(
s
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n
g
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e
a
n
d
t
w
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d
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g
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t
)
S
t
r
a
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g
y
-
N
u
m
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l
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(
s
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g
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a
n
d
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w
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d
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U
s
e
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g
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b
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W
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1
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C
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c
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d
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A
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1
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1
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S
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1
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s
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u
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r
u
p
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2
0
A
d
d
m
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s
s
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n
g
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l
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m
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m
a
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m
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t
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w
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t
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s
u
p
t
o
2
0
A
d
d
3
n
u
m
b
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r
s
(
m
i
x
o
f
s
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n
g
l
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o
r
t
w
o
d
i
g
i
t
n
u
m
b
e
r
s
)
I
W
o
r
d
p
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b
l
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m
s
I
A
d
d
m
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p
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f
1
0
0
'
s
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g
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d
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A
d
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f
1
0
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s
t
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w
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d
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g
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t
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u
m
b
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S
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b
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c
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p
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f
1
0
0
'
s
f
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m
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d
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g
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m
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P
a
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I
P
a
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I
I
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C
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p
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a
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t
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b
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r
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p
t
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5
0
A
d
d
m
i
s
s
i
n
g
e
l
e
m
e
n
t
s
t
o
m
a
k
e
a
s
t
a
t
e
m
e
n
t
t
r
u
e
w
i
t
h
t
o
t
a
l
s
u
p
t
o
5
0
I
n
e
q
u
a
l
i
t
i
e
s
w
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t
h
a
d
d
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t
i
o
n
a
n
d
s
u
b
t
r
a
c
t
i
o
n
s
t
a
t
e
m
e
n
t
s
A
d
d
3
n
u
m
b
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r
s
(
m
i
x
o
f
s
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n
g
l
e
o
r
t
w
o
d
i
g
i
t
n
u
m
b
e
r
s
)
I
I
A
d
d
a
n
d
s
u
b
t
r
a
c
t
t
h
r
e
e
d
i
g
i
t
n
u
m
b
e
r
s
I
A
d
d
a
n
d
s
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b
t
r
a
c
t
t
h
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d
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g
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t
n
u
m
b
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r
s
I
I
A
d
d
a
n
d
s
u
b
t
r
a
c
t
f
o
u
r
d
i
g
i
t
n
u
m
b
e
r
s
I
Lesson
Practice
A
d
d
a
n
d
s
u
b
t
r
a
c
t
f
o
u
r
d
i
g
i
t
n
u
m
b
e
r
s
I
I
W
o
r
d
p
r
o
b
l
e
m
s
I
I
U
s
e
r
o
u
n
d
i
n
g
t
o
e
s
t
i
m
a
t
e
s
o
l
u
t
i
o
n
s
f
o
r
a
d
d
i
t
i
o
n
a
n
d
s
u
b
t
r
a
c
t
i
o
n
P
a
t
t
e
r
n
s
i
n
a
d
d
i
t
i
o
n
a
n
d
s
u
b
t
r
a
c
t
i
o
n
I
P
a
t
t
e
r
n
s
i
n
a
d
d
i
t
i
o
n
a
n
d
s
u
b
t
r
a
c
t
i
o
n
I
I
C
o
m
p
l
e
t
e
s
t
a
t
e
m
e
n
t
s
t
o
m
a
k
e
a
t
a
r
g
e
t
n
u
m
b
e
r
u
p
t
o
1
0
0
A
d
d
3
n
u
m
b
e
r
s
(
m
i
x
o
f
s
i
n
g
l
e
,
t
w
o
a
n
d
t
h
r
e
e
d
i
g
i
t
n
u
m
b
e
r
s
)
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Class III
Add and subtract four digit numbers I
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