I want 8th std 1st lesson practice set 1.1
Answers
Answer:
lAns. (i)
=
[Using associative property]
=
[Using distributive property]
= =
= = = = 2
(ii)
Ans. (ii)
=
[Using associative property]
=
[Using distributive property]
= =
= = =
2. Write the additive inverse of each of the following:
(i)
(ii)
(iii)
(iv)
(v)
Ans 2. We know that additive inverse of a rational number is such that
(i) Additive inverse of is
(ii) Additive inverse of is
(iii) Additive inverse of is
(iv) Additive inverse of is
(v) Additive inverse of is
NCERT Solutions for Class 8 Maths Exercise 1.1
3. Verify that for:
(i)
(ii)
Ans 3.(i) Putting in
L.H.S. = R.H.S.
Hence, verified.
(ii)Putting in
L.H.S. = R.H.S.
Hence, verified.
NCERT Solutions for Class 8 Maths Exercise 1.1
4. Find the multiplicative inverse of the following:
(i)
(ii)
(iii)
(iv)
(v)
(vi)
Ans 4. We know that multiplicative inverse of a rational number is such that
(i) Multiplicative inverse of is
(ii) Multiplicative inverse of is
(iii) Multiplicative inverse of is
(iv) Multiplicative inverse of is
(v) Multiplicative inverse of is
(vi) Multiplicative inverse of is
NCERT Solutions for Class 8 Maths Exercise 1.1
5. Name the property under multiplication used in each of the following:
(i)
(ii)
(iii)
Ans 5.(i) 1 is the multiplicative identity.
(ii) Commutative property.
(iii) Multiplicative Inverse property.
NCERT Solutions for Class 8 Maths Exercise 1.1
6. Multiply by the reciprocal of
Ans 6.The reciprocal of is
According to the question,
=
NCERT Solutions for Class 8 Maths Exercise 1.1
7. Tell what property allows you to compute
as
Ans 7. By using associative property of multiplication, we will compute as .
NCERT Solutions for Class 8 Maths Exercise 1.1
8. Is the multiplicative inverse of
Why or why not?
Ans 8. Since multiplicative inverse of a rational number is if
Therefore, = =
But its product must be positive 1.
Therefore, is not the multiplicative inverse of
NCERT Solutions for Class 8 Maths Exercise 1.1
9. Is 0.3 the multiplicative inverse of Why or why not?
Ans. 9. Since multiplicative inverse of a rational number is if
Therefore, = = 1
Therefore, Yes 0.3 is the multiplicative inverse of
10.Write:
(i) The rational number that does not have a reciprocal.
(ii) The rational numbers that are equal to their reciprocals.