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C
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R
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M
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N
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C
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N
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b
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N
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w
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O
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P
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R
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t
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R
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d
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N
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w
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a
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d
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m
b
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(
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b
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)
O
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P
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t
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n
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b
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C
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t
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c
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b
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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
o
m
p
a
r
e
n
u
m
b
e
r
s
(
b
i
l
l
i
o
n
s
)
E
s
t
i
m
a
t
i
n
g
O
b
j
e
c
t
s
(
I
n
v
e
s
t
i
g
a
t
i
o
n
)
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Book a Demo
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United Kingdom
Primary
Construct numbers (billions)
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