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P
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C
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Lesson
Practice
E
x
p
a
n
d
e
d
n
o
t
a
t
i
o
n
a
s
p
o
w
e
r
s
o
f
1
0
C
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m
p
a
r
e
n
u
m
b
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s
(
b
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l
l
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o
n
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)
E
s
t
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m
a
t
i
n
g
O
b
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c
t
s
(
I
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v
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t
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a
t
i
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n
)
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Construct numbers (billions)
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