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N
u
m
b
e
r
(
a
d
d
/
s
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b
)
S
i
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g
l
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d
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c
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A
d
d
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n
f
a
c
t
f
a
m
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l
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(
a
+
b
=
c
,
c
-
b
=
a
)
F
a
c
t
F
a
m
i
l
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e
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(
I
n
v
e
s
t
i
g
a
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n
)
R
e
p
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s
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n
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a
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f
a
d
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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a
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g
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-
B
r
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1
0
(
s
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S
t
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C
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(
s
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)
S
t
r
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-
N
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(
s
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w
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U
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C
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1
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1
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1
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p
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2
0
A
d
d
m
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s
s
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n
g
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l
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m
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a
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w
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p
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2
0
A
d
d
3
n
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m
b
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m
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b
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I
W
o
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d
p
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b
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I
Lesson
Practice
A
d
d
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p
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1
0
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s
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A
d
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1
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s
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d
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1
0
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s
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P
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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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w
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p
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o
5
0
I
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q
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A
d
d
3
n
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m
b
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I
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A
d
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I
I
A
d
d
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f
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d
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d
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p
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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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KeyStage 2 Lower
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