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N
u
m
b
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a
d
d
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S
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f
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m
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a
+
b
=
c
,
c
-
b
=
a
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F
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F
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m
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l
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I
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R
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s
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S
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C
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S
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N
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s
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U
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1
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A
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5
0
A
d
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w
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p
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5
0
I
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q
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A
d
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3
n
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b
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d
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I
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A
d
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Lesson
P
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1
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A
d
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3
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M
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Use rounding to estimate solutions for addition and subtraction
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