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Class VI
Class VII
Class VIII
Class IX
Class X
CBSE Grade IX - Number Systems
Question
1
1.
Rationalise the denominator of
1
(
−
√
5
+
√
6
)
(
√
3
+
√
6
)
(
√
8
+
√
6
)
(
√
5
+
4
√
6
)
(
√
5
+
√
6
)
(
√
5
+
6
)
Question
2
2.
9.1 =
91
91
100
91
1000
91
10
910
Question
3
3.
3
√
9
✕
(
−
7
√
7
)
=
(
−
63
√
10
)
(
−
441
)
(
−
63
√
5
)
(
−
63
4
√
7
)
(
−
63
√
7
)
Question
4
4.
Express
171
1000
as a decimal correct to 3 decimal places
-0.029
0.017
0.171
0.271
1.71
Question
5
5.
(
-7
✕
6
✕
3
)
5
=
(-7)
5
✕
9
5
✕
6
5
(-7)
5
✕
6
4
✕
3
4
(-7)
5
✕
6
6
✕
3
6
(-7)
5
✕
4
5
✕
3
3
(-7)
5
✕
6
5
✕
3
5
Question
6
6.
1.17 =
117
100
117
10000
117
117
1000
117
10
Question
7
7.
-5
(
-2
7
)
=
6
(
-7
2
)
5
(
-9
2
)
5
(
-5
2
)
5
(
-7
2
)
4
(
-7
2
)
Question
8
8.
The solution of
√
5
lies between
2.22 and 2.23
2.24 and 2.25
2.23 and 2.24
2.25 and 2.26
2.21 and 2.22
Question
9
9.
Simplify the expression
-3
(
5
2
)
✕
-2
(
5
2
)
-4
(
5
2
)
-6
(
5
2
)
-5
(
7
2
)
-5
(
5
2
)
-5
(
3
2
)
Question
10
10.
Convert the non-terminating recurring decimal
12.55555555555555...
to rational number
113
9
37
3
115
9
113
11
113
7
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