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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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b
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c
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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
)
Lesson
Practice
F
a
c
t
F
a
m
i
l
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(
I
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v
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b
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c
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d
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1
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(
s
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a
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a
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C
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m
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(
s
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g
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a
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d
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S
t
r
a
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g
y
-
N
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b
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l
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(
s
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a
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d
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Class III
Addition fact families (a+b=c, c-b=a)
Lesson
Practice
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