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N
u
m
b
e
r
(
a
d
d
/
s
u
b
)
S
i
n
g
l
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d
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g
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d
d
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d
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A
d
d
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f
a
c
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f
a
m
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l
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(
a
+
b
=
c
,
c
-
b
=
a
)
R
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p
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s
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n
t
a
t
i
o
n
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f
a
d
d
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s
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b
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b
j
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c
t
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S
t
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a
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g
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B
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1
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S
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C
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Lesson
Practice
S
t
r
a
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g
y
-
N
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L
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Stage 1
Strategy - Compensation (single and double digit)
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