The document Worksheet Question - Exponents and Powers Class 7 Notes | EduRev is a part of the Class 7 Course Mathematics (Maths) Class 7.

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**Q.1. Fill in the blanks :**

**(a)**

**(b) (â€“3) ^{3} Ã— (â€“3)^{4} = ....................**

**Ans. **

(a)

(b) (â€“3)^{7}

**Q.2. Evaluate : **

**(a) Find the value of x :**

**(b) Find the value of a :**

**Ans. **(a) x = 3

(b) a = 23

**Q.3. Match of column :**

** **

**Ans. **

Column 'A' (Column 'B'

(a) (v)

(b) (iv)

(c) (i)

(d) (iii)

(e) (ii)

**Q.4. Write in the standard form : (a) The distance between Earth and Moon is 384,000 km. (b) Speed of light in vacuum is 300,000,000 m/s (c) 0.0034256**

**Ans. **(a) 3.84 Ã— 10^{5} km

(b) 3 Ã— 10^{8} m/s

(c) 3.4256 Ã— 10^{â€“3}

**Q.5. Find the value of x :**

**(a) **

**(b) **

**Ans. **(a) 32

(b) 23

**Q.6. Simplify :**

**(a) **

**(b) **

**Ans. **

(a)

(b)

**Q.7. Simplify :**

**(a) (â€“3) ^{2}^{ }Ã— (â€“5)^{2} **

**(b) [(-16) ^{6} Ã· (-16)^{3} ] x (-16)^{3}**

**Ans. **(a) 225

(b) 1

**Q.8. Find the value of : (a) 2Â° Ã— 3Â° Ã— 4Â° (b) 3Â° Ã— 5Â° + 19Â° (c) (7Â° Ã· 3Â°) Ã— (8Â° â€“ 5Â°) (d) 4Â° Ã— 6Â° + 100Â°**

**Ans. **

(a) 1

(b) 3

(c) 0

(d) 2

**Q.9. Fill in the blanks :**

**Ans. **

**Q.10. Simplify and write the answer in scientific rotation : (a) (5 Ã— 10 ^{3}) Ã— (3 Ã— 10^{5}) **

**(b) **

**Ans. **(a) 1.5 Ã—10^{9}

(b) 5 Ã— 10^{1 }

**Q.11. Find m for the following :**

**(a) **

**(b)**

**Ans. **(a) m = 5

(b) m = 3

**Q.12. Using the standard form, write number 73984 in expanded form.**

**Ans. **7 Ã— 10^{4} + 3 Ã—10^{3 }+ 9 Ã— 10^{2 }+ 8 Ã— 10^{1} + 4 Ã— 10Â°

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