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N
u
m
b
e
r
(
a
d
d
/
s
u
b
)
S
i
n
g
l
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d
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a
d
d
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a
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d
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b
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a
c
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A
d
d
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t
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n
f
a
c
t
f
a
m
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l
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e
s
(
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
t
i
o
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)
R
e
p
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s
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n
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a
t
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a
d
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s
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b
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s
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g
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b
j
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c
t
s
S
t
r
a
t
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g
y
-
B
r
i
d
g
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t
o
1
0
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s
i
n
g
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a
n
d
t
w
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d
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g
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t
)
S
t
r
a
t
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g
y
-
C
o
m
p
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n
s
a
t
i
o
n
(
s
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n
g
l
e
a
n
d
t
w
o
d
i
g
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)
S
t
r
a
t
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g
y
-
N
u
m
b
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l
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s
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a
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d
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w
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d
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)
U
s
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b
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c
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1
0
0
C
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c
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a
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1
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1
0
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s
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1
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s
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Lesson
Practice
P
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2
0
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2
0
A
d
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3
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b
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5
0
A
d
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g
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m
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5
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1
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A
d
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3
n
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b
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m
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w
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)
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United Kingdom
England
KeyStage 2 Lower
Subtract multiples of 10's from two digit numbers
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