Extra Questions- Exponents and Powers Class 8 Notes | EduRev

Class 8 Mathematics by Full Circle

Created by: Full Circle

Class 8 : Extra Questions- Exponents and Powers Class 8 Notes | EduRev

The document Extra Questions- Exponents and Powers Class 8 Notes | EduRev is a part of the Class 8 Course Class 8 Mathematics by Full Circle.
All you need of Class 8 at this link: Class 8

Question 1: Find the value of:  Extra Questions- Exponents and Powers Class 8 Notes | EduRev
Solution:
Extra Questions- Exponents and Powers Class 8 Notes | EduRev
Extra Questions- Exponents and Powers Class 8 Notes | EduRev

Question 2:  Simplify:  Extra Questions- Exponents and Powers Class 8 Notes | EduRev

Solution:  

Extra Questions- Exponents and Powers Class 8 Notes | EduRev
         
Extra Questions- Exponents and Powers Class 8 Notes | EduRev
Extra Questions- Exponents and Powers Class 8 Notes | EduRev
Thuss,
Extra Questions- Exponents and Powers Class 8 Notes | EduRev

Question 3: Find the value of m when Extra Questions- Exponents and Powers Class 8 Notes | EduRev
Solution: We have
Extra Questions- Exponents and Powers Class 8 Notes | EduRev
Since base is same on both sides, then their exponents are same.
∴ m – 5 = 3
⇒ m = 3 + 5 = 8
Thus, the required value of m is 8.

Question 4: Simplify:  Extra Questions- Exponents and Powers Class 8 Notes | EduRev
Solution:
Extra Questions- Exponents and Powers Class 8 Notes | EduRev
Question 5: Write the following in standard form:
(i) 0.000000456 and (ii) 34500000.

Solution: We have
Extra Questions- Exponents and Powers Class 8 Notes | EduRev
                          Extra Questions- Exponents and Powers Class 8 Notes | EduRev
Thus, 0.000000456 = 4.56 * 10–7

(ii) 34500000 = 345 * 100000
= 3.45 * 100 * 100000
= 3.45 * 102 * 105 = 3.45 * 102+5
= 3.45 * 107
Thus, 34500000 = 3.45 * 107

Question 6: Express 2.0001 * 109 in usual form.
Solution: We have
           Extra Questions- Exponents and Powers Class 8 Notes | EduRev
                               = 20001 * 100000
                               = 2000100000
Thus, 2.0001 * 109 = 2000100000

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