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N
u
m
b
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(
a
d
d
/
s
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b
)
S
i
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c
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m
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(
a
+
b
=
c
,
c
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b
=
a
)
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2
0
A
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Lesson
Practice
C
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m
p
l
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t
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s
t
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m
e
n
t
s
t
o
m
a
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n
u
m
b
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r
u
p
t
o
5
0
A
d
d
m
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w
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t
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s
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p
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o
5
0
I
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q
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w
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d
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t
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A
d
d
3
n
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b
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I
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A
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p
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o
1
0
0
A
d
d
3
n
u
m
b
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s
(
m
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x
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f
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,
t
w
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a
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d
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h
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d
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g
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b
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s
)
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Stage 1
Patterns in subtraction III
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