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N
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b
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a
d
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S
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m
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(
a
+
b
=
c
,
c
-
b
=
a
)
F
a
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F
a
m
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(
I
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t
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R
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S
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C
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N
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d
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)
I
W
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d
p
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I
A
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1
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1
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1
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p
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b
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u
p
t
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5
0
A
d
d
m
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s
s
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g
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l
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m
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s
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m
a
k
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m
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t
t
r
u
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w
i
t
h
t
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s
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p
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5
0
I
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q
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w
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Lesson
Practice
A
d
d
3
n
u
m
b
e
r
s
(
m
i
x
o
f
s
i
n
g
l
e
o
r
t
w
o
d
i
g
i
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
t
h
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d
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g
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m
b
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s
I
A
d
d
a
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d
s
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b
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a
c
t
t
h
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d
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g
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t
n
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m
b
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s
I
I
A
d
d
a
n
d
s
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b
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a
c
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f
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r
d
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g
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n
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m
b
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s
I
A
d
d
a
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d
s
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b
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c
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f
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d
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g
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b
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s
I
I
W
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d
p
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b
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m
s
I
I
U
s
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n
d
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g
t
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s
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l
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d
d
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c
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P
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s
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a
d
d
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t
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d
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b
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I
P
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d
d
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d
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I
I
C
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m
p
l
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s
t
a
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m
e
n
t
s
t
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m
a
k
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a
t
a
r
g
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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
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t
n
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m
b
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s
)
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KeyStage 2 Lower
Inequalities with addition and subtraction statements
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