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N
u
m
b
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(
a
d
d
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s
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S
i
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A
d
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f
a
c
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f
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m
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(
a
+
b
=
c
,
c
-
b
=
a
)
F
a
c
t
F
a
m
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l
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I
n
v
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s
t
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)
R
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p
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s
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S
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C
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s
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S
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N
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U
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Lesson
Practice
U
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1
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1
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2
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5
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5
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I
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1
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A
d
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3
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Class III
Word sentences for addition and subtraction
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