IB Mathematics Analysis and Approaches Quiz
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NUMBER AND ALGEBRA
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If
x
=
a
×
10
n
x = a \times 10^n
x
=
a
×
1
0
n
and
y
=
b
×
10
n
+
2
y = b \times 10^{n+2}
y
=
b
×
1
0
n
+
2
, where
1
≤
a
,
b
<
10
1 \le a, b < 10
1
≤
a
,
b
<
10
and
n
n
n
is a positive integer, which of the following best approximates the value of
x
+
y
x+y
x
+
y
?
A
(
a
+
b
)
×
10
n
(a+b) \times 10^n
(
a
+
b
)
×
1
0
n
B
b
×
10
n
+
2
b \times 10^{n+2}
b
×
1
0
n
+
2
C
(
a
+
b
)
×
10
n
+
2
(a+b) \times 10^{n+2}
(
a
+
b
)
×
1
0
n
+
2
D
a
×
10
n
a \times 10^n
a
×
1
0
n
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