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N
u
m
b
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(
a
d
d
/
s
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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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A
d
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
)
R
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p
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s
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n
t
a
t
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f
a
d
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s
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b
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b
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c
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S
t
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g
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B
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1
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(
s
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d
d
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b
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S
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C
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S
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N
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1
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s
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2
0
Lesson
Practice
A
d
d
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s
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w
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a
l
s
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p
t
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2
0
A
d
d
3
n
u
m
b
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(
m
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x
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g
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w
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t
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b
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W
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d
p
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b
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I
A
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1
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1
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f
1
0
0
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b
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p
t
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5
0
A
d
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p
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5
0
I
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A
d
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3
n
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I
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A
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1
0
0
A
d
d
3
n
u
m
b
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(
m
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x
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w
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)
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Book a Demo
Hong Kong
Stage 1
Complete statements to make a target number up to 20
Lesson
Practice
What is Mathspace
About Mathspace
