EduSahara™ Assignment
Name : Properties of Real Numbers
Chapter : Real Numbers
Grade : SSC Grade X
License : Non Commercial Use
Question
1
1.
Which of the following are true?
a)
real numbers are closed under addition
b)
real numbers are closed under subtraction
c)
real numbers are closed under division
d)
real numbers are closed under multiplication
(i)
{c,b}
(ii)
{c,a}
(iii)
{c,d}
(iv)
{c,a,b}
(v)
{a,b,d}
Question
2
2.
The additive inverse of
9
2
is
(i)
(
-5
1
2
)
(ii)
0
(iii)
(
-9
2
)
(iv)
2
-9
(v)
2
9
Question
3
3.
The multiplicative inverse of
(
-3
7
)
is
(i)
(
-3
1
3
)
(ii)
(
-7
3
)
(iii)
(
-1
3
)
(iv)
(
-1
1
3
)
(v)
(
-4
1
3
)
Question
4
4.
Which of the following are true?
a)
15
16
✕
22
3
=
22
3
✕
15
16
b)
15
16
+
17
2
=
17
2
+
15
16
c)
20
7
−
17
2
=
17
2
−
20
7
d)
20
7
÷
22
3
=
22
3
÷
20
7
(i)
{d,b}
(ii)
{c,d,a}
(iii)
{c,b,a}
(iv)
{c,a}
(v)
{a,b}
Question
5
5.
Which of the following are true?
a)
20
9
−
(
46
7
−
5
8
)
=
(
20
9
−
46
7
)
−
5
8
b)
20
9
÷
(
59
6
÷
19
6
)
=
(
20
9
÷
59
6
)
÷
19
6
c)
4
13
+
(
46
7
+
2
13
)
=
(
4
13
+
46
7
)
+
2
13
d)
4
13
✕
(
59
6
✕
1
10
)
=
(
4
13
✕
59
6
)
✕
1
10
(i)
{a,d,c}
(ii)
{a,c}
(iii)
{c,d}
(iv)
{b,d}
(v)
{a,b,c}
Question
6
6.
Which of the following are true?
a)
17
18
✕
(
54
7
−
7
8
)
=
(
17
18
✕
54
7
)
−
(
17
18
✕
7
8
)
b)
9
20
−
(
54
7
✕
5
16
)
=
(
9
20
−
54
7
)
✕
(
9
20
−
5
16
)
c)
9
20
÷
(
36
13
+
14
5
)
=
(
9
20
÷
36
13
)
+
(
9
20
÷
14
5
)
d)
17
18
✕
(
36
13
+
11
5
)
=
(
17
18
✕
36
13
)
+
(
17
18
✕
11
5
)
(i)
{b,d,a}
(ii)
{c,d}
(iii)
{a,d}
(iv)
{b,a}
(v)
{b,c,a}
Question
7
7.
Which of the following is true?
a)
18.1200
✕
6.2100
=
6.2100
✕
18.1200
b)
10.4300
−
18.9700
=
18.9700
−
10.4300
c)
6.2100
+
10.4300
=
10.4300
+
6.2100
d)
18.9700
÷
18.1200
=
18.1200
÷
18.9700
(i)
{d,c}
(ii)
{b,d,a}
(iii)
{b,a}
(iv)
{b,c,a}
(v)
{a,c}
Question
8
8.
Which of the following is true?
a)
11.7100
✕
(
5.2200
✕
11.9200
)
=
(
11.7100
✕
5.2200
)
✕
11.9200
b)
11.9200
−
(
17.2900
−
11.7100
)
=
(
11.9200
−
17.2900
)
−
11.7100
c)
5.2200
+
(
11.9200
+
17.2900
)
=
(
5.2200
+
11.9200
)
+
17.2900
d)
17.2900
÷
(
11.7100
÷
5.2200
)
=
(
17.2900
÷
11.7100
)
÷
5.2200
(i)
{b,a}
(ii)
{b,c,a}
(iii)
{b,d,a}
(iv)
{d,c}
(v)
{a,c}
Question
9
9.
Which of the following is true?
a)
13.6500
✕
(
6.7800
−
20.9800
)
=
(
13.6500
✕
6.7800
)
−
(
13.6500
✕
20.9800
)
b)
3.4000
✕
(
13.6500
+
6.7800
)
=
(
3.4000
✕
13.6500
)
+
(
3.4000
✕
6.7800
)
c)
6.7800
−
(
20.9800
✕
3.4000
)
=
(
6.7800
−
20.9800
)
✕
(
6.7800
−
3.4000
)
d)
20.9800
÷
(
3.4000
+
13.6500
)
=
(
20.9800
÷
3.4000
)
+
(
20.9800
÷
13.6500
)
(i)
{c,d,a}
(ii)
{c,a}
(iii)
{a,b}
(iv)
{c,b,a}
(v)
{d,b}
Assignment Key
1) (v)
2) (iii)
3) (ii)
4) (v)
5) (iii)
6) (iii)
7) (v)
8) (v)
9) (iii)
