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Exponents and Powers Class 8 Extra Questions
NCERT Solutions for Class 8 Maths Chapter 12 Exponents and Powers Exercise 12.1
Ex 12.1 Class 8 Maths Question 1.
Evaluate:
(i) 3-2
(ii) (-4)-2
(iii) (12)-5
Solution:
Ex 12.1 Class 8 Maths Question 2.
Simplify and express the result in power notation with a positive exponent.
Solution:
Ex 12.1 Class 8 Maths Question 3.
Find the value of
Solution:
Ex 12.1 Class 8 Maths Question 4.
Solution:
Ex 12.1 Class 8 Maths Question 5.
Find the value of m for which 5m ÷ 5-3 = 55.
Solution:
5m ÷ 5-3 = 55
⇒ 5m-(-3) = 55 [∵ am ÷ an = am-n]
⇒ 5m+3 = 55
Comparing the powers of equal bases, we have
m + 3 = 5
m = 5 – 3 = 2, i.e., m = 2
Ex 12.1 Class 8 Maths Question 6.
Evaluate:
Solution:
Ex 12.1 Class 8 Maths Question 7.
Simplify:
Solution:
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