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N
u
m
b
e
r
(
a
d
d
/
s
u
b
)
S
i
n
g
l
e
d
i
g
i
t
a
d
d
i
t
i
o
n
a
n
d
s
u
b
t
r
a
c
t
i
o
n
A
d
d
i
t
i
o
n
f
a
c
t
f
a
m
i
l
i
e
s
(
a
+
b
=
c
,
c
-
b
=
a
)
F
a
c
t
F
a
m
i
l
i
e
s
(
I
n
v
e
s
t
i
g
a
t
i
o
n
)
R
e
p
r
e
s
e
n
t
a
t
i
o
n
o
f
a
d
d
/
s
u
b
u
s
i
n
g
o
b
j
e
c
t
s
S
t
r
a
t
e
g
y
-
B
r
i
d
g
e
t
o
1
0
(
s
i
n
g
l
e
a
n
d
t
w
o
d
i
g
i
t
)
S
t
r
a
t
e
g
y
-
C
o
m
p
e
n
s
a
t
i
o
n
(
s
i
n
g
l
e
a
n
d
t
w
o
d
i
g
i
t
)
Lesson
Practice
S
t
r
a
t
e
g
y
-
N
u
m
b
e
r
l
i
n
e
(
s
i
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g
l
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a
n
d
t
w
o
d
i
g
i
t
)
U
s
e
s
t
r
a
t
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g
i
e
s
t
o
a
d
d
/
s
u
b
t
r
a
c
t
t
w
o
d
i
g
i
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n
u
m
b
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r
s
W
o
r
d
s
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n
t
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c
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s
f
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d
d
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d
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b
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c
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g
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a
d
d
/
s
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b
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a
c
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c
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s
s
t
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1
0
0
C
o
n
n
e
c
t
a
d
d
i
t
i
o
n
a
n
d
s
u
b
t
r
a
c
t
i
o
n
A
d
d
m
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l
t
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p
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s
o
f
1
0
'
s
t
o
s
i
n
g
l
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d
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g
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n
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m
b
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A
d
d
m
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t
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p
l
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s
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f
1
0
'
s
t
o
t
w
o
d
i
g
i
t
n
u
m
b
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s
S
u
b
t
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c
t
m
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p
l
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s
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f
1
0
'
s
f
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m
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w
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d
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P
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P
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b
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r
u
p
t
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2
0
A
d
d
m
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s
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g
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l
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m
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2
0
A
d
d
3
n
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b
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m
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I
W
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I
A
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1
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s
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d
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A
d
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1
0
0
'
s
t
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w
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d
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g
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n
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m
b
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S
u
b
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c
t
m
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l
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p
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s
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f
1
0
0
'
s
f
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t
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d
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b
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P
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I
P
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I
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p
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k
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b
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p
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5
0
A
d
d
m
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s
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g
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l
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m
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n
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t
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m
a
k
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m
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w
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s
u
p
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o
5
0
I
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q
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w
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d
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3
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I
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d
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A
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d
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1
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A
d
d
3
n
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m
b
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s
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m
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x
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w
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d
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h
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d
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g
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b
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s
)
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United Kingdom
England
KeyStage 2 Lower
Strategy - Compensation (single and two digit)
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